/**
* Utility methods used by JSData.
*
* @example
* import {utils} from 'js-data'
* console.log(utils.isString('foo')) // true
*
* @namespace utils
* @type {Object}
*/
const DOMAIN = 'utils'
const INFINITY = 1 / 0
const MAX_INTEGER = 1.7976931348623157e+308
const BOOL_TAG = '[object Boolean]'
const DATE_TAG = '[object Date]'
const FUNC_TAG = '[object Function]'
const NUMBER_TAG = '[object Number]'
const OBJECT_TAG = '[object Object]'
const REGEXP_TAG = '[object RegExp]'
const STRING_TAG = '[object String]'
const objToString = Object.prototype.toString
const PATH = /^(.+)\.(.+)$/
const ERRORS = {
'400' () { return `expected: ${arguments[0]}, found: ${arguments[2] ? arguments[1] : typeof arguments[1]}` },
'404' () { return `${arguments[0]} not found` }
}
const toInteger = function (value) {
if (!value) {
return 0
}
// Coerce to number
value = +value
if (value === INFINITY || value === -INFINITY) {
const sign = (value < 0 ? -1 : 1)
return sign * MAX_INTEGER
}
const remainder = value % 1
return value === value ? (remainder ? value - remainder : value) : 0 // eslint-disable-line
}
const toStr = function (value) {
return objToString.call(value)
}
const isPlainObject = function (value) {
return (!!value && typeof value === 'object' && value.constructor === Object)
}
const mkdirP = function (object, path) {
if (!path) {
return object
}
const parts = path.split('.')
parts.forEach(function (key) {
if (!object[key]) {
object[key] = {}
}
object = object[key]
})
return object
}
const utils = {
/**
* Reference to the Promise constructor used by JSData. Defaults to
* `window.Promise` or `global.Promise`.
*
* @example <caption>Make JSData use a different `Promise` constructor</caption>
* import Promise from 'bluebird'
* import {utils} from 'js-data'
* utils.Promise = Promise
*
* @name utils.Promise
* @since 3.0.0
* @type {Function}
*/
Promise: Promise,
/**
* Shallow copy properties that meet the following criteria from `src` to
* `dest`:
*
* - own enumerable
* - not a function
* - does not start with "_"
*
* @method utils._
* @param {Object} dest Destination object.
* @param {Object} src Source object.
* @private
* @since 3.0.0
*/
_ (dest, src) {
utils.forOwn(src, function (value, key) {
if (key && utils.isUndefined(dest[key]) && !utils.isFunction(value) && key.indexOf('_') !== 0) {
dest[key] = value
}
})
},
/**
* Recursively iterates over relations found in `opts.with`.
*
* @method utils._forRelation
* @param {Object} opts Configuration options.
* @param {Relation} def Relation definition.
* @param {Function} fn Callback function.
* @param {*} [thisArg] Execution context for the callback function.
* @private
* @since 3.0.0
*/
_forRelation (opts, def, fn, thisArg) {
const relationName = def.relation
let containedName = null
let index
opts || (opts = {})
opts.with || (opts.with = [])
if ((index = utils._getIndex(opts.with, relationName)) >= 0) {
containedName = relationName
} else if ((index = utils._getIndex(opts.with, def.localField)) >= 0) {
containedName = def.localField
}
if (opts.withAll) {
fn.call(thisArg, def, {})
return
} else if (!containedName) {
return
}
let optsCopy = {}
utils.fillIn(optsCopy, def.getRelation())
utils.fillIn(optsCopy, opts)
optsCopy.with = opts.with.slice()
optsCopy._activeWith = optsCopy.with.splice(index, 1)[0]
optsCopy.with.forEach(function (relation, i) {
if (relation && relation.indexOf(containedName) === 0 && relation.length >= containedName.length && relation[containedName.length] === '.') {
optsCopy.with[i] = relation.substr(containedName.length + 1)
} else {
optsCopy.with[i] = ''
}
})
fn.call(thisArg, def, optsCopy)
},
/**
* Find the index of a relation in the given list
*
* @method utils._getIndex
* @param {string[]} list List to search.
* @param {string} relation Relation to find.
* @private
* @returns {number}
*/
_getIndex (list, relation) {
let index = -1
list.forEach(function (_relation, i) {
if (_relation === relation) {
index = i
return false
} else if (utils.isObject(_relation)) {
if (_relation.relation === relation) {
index = i
return false
}
}
})
return index
},
/**
* Define hidden (non-enumerable), writable properties on `target` from the
* provided `props`.
*
* @example
* import {utils} from 'js-data'
* function Cat () {}
* utils.addHiddenPropsToTarget(Cat.prototype, {
* say () {
* console.log('meow')
* }
* })
* const cat = new Cat()
* cat.say() // "meow"
*
* @method utils.addHiddenPropsToTarget
* @param {Object} target That to which `props` should be added.
* @param {Object} props Properties to be added to `target`.
* @since 3.0.0
*/
addHiddenPropsToTarget (target, props) {
const map = {}
Object.keys(props).forEach(function (propName) {
const descriptor = Object.getOwnPropertyDescriptor(props, propName)
descriptor.enumerable = false
map[propName] = descriptor
})
Object.defineProperties(target, map)
},
/**
* Return whether the two objects are deeply different.
*
* @example
* import {utils} from 'js-data'
* utils.areDifferent({}, {}) // false
* utils.areDifferent({ a: 1 }, { a: 1 }) // false
* utils.areDifferent({ foo: 'bar' }, {}) // true
*
* @method utils.areDifferent
* @param {Object} a Base object.
* @param {Object} b Comparison object.
* @param {Object} [opts] Configuration options.
* @param {Function} [opts.equalsFn={@link utils.deepEqual}] Equality function.
* @param {Array} [opts.ignore=[]] Array of strings or RegExp of fields to ignore.
* @returns {boolean} Whether the two objects are deeply different.
* @see utils.diffObjects
* @since 3.0.0
*/
areDifferent (newObject, oldObject, opts) {
opts || (opts = {})
const diff = utils.diffObjects(newObject, oldObject, opts)
const diffCount = Object.keys(diff.added).length +
Object.keys(diff.removed).length +
Object.keys(diff.changed).length
return diffCount > 0
},
/**
* Verified that the given constructor is being invoked via `new`, as opposed
* to just being called like a normal function.
*
* @example
* import {utils} from 'js-data'
* function Cat () {
* utils.classCallCheck(this, Cat)
* }
* const cat = new Cat() // this is ok
* Cat() // this throws an error
*
* @method utils.classCallCheck
* @param {*} instance Instance that is being constructed.
* @param {Constructor} ctor Constructor function used to construct the
* instance.
* @since 3.0.0
* @throws {Error} Throws an error if the constructor is being improperly
* invoked.
*/
classCallCheck (instance, ctor) {
if (!(instance instanceof ctor)) {
throw utils.err(`${ctor.name}`)(500, 'Cannot call a class as a function')
}
},
/**
* Deep copy a value.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: { bar: 'baz' } }
* const b = utils.copy(a)
* a === b // false
* utils.areDifferent(a, b) // false
*
* @param {*} from Value to deep copy.
* @param {*} [to] Destination object for the copy operation.
* @param {*} [stackFrom] For internal use.
* @param {*} [stackTo] For internal use.
* @param {string[]|RegExp[]} [blacklist] List of strings or RegExp of
* properties to skip.
* @param {boolean} [plain] Whether to make a plain copy (don't try to use
* original prototype).
* @returns {*} Deep copy of `from`.
* @since 3.0.0
*/
copy (from, to, stackFrom, stackTo, blacklist, plain) {
if (!to) {
to = from
if (from) {
if (utils.isArray(from)) {
to = utils.copy(from, [], stackFrom, stackTo, blacklist, plain)
} else if (utils.isDate(from)) {
to = new Date(from.getTime())
} else if (utils.isRegExp(from)) {
to = new RegExp(from.source, from.toString().match(/[^\/]*$/)[0])
to.lastIndex = from.lastIndex
} else if (utils.isObject(from)) {
if (plain) {
to = utils.copy(from, {}, stackFrom, stackTo, blacklist, plain)
} else {
to = utils.copy(from, Object.create(Object.getPrototypeOf(from)), stackFrom, stackTo, blacklist, plain)
}
}
}
} else {
if (from === to) {
throw utils.err(`${DOMAIN}.copy`)(500, 'Cannot copy! Source and destination are identical.')
}
stackFrom = stackFrom || []
stackTo = stackTo || []
if (utils.isObject(from)) {
let index = stackFrom.indexOf(from)
if (index !== -1) {
return stackTo[index]
}
stackFrom.push(from)
stackTo.push(to)
}
let result
if (utils.isArray(from)) {
let i
to.length = 0
for (i = 0; i < from.length; i++) {
result = utils.copy(from[i], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[i])) {
stackFrom.push(from[i])
stackTo.push(result)
}
to.push(result)
}
} else {
if (utils.isArray(to)) {
to.length = 0
} else {
utils.forOwn(to, function (value, key) {
delete to[key]
})
}
for (var key in from) {
if (from.hasOwnProperty(key)) {
if (utils.isBlacklisted(key, blacklist)) {
continue
}
result = utils.copy(from[key], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[key])) {
stackFrom.push(from[key])
stackTo.push(result)
}
to[key] = result
}
}
}
}
return to
},
/**
* Recursively shallow fill in own enumerable properties from `source` to
* `dest`.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: { bar: 'baz' }, beep: 'boop' }
* const b = { beep: 'bip' }
* utils.deepFillIn(b, a)
* console.log(b) // {"foo":{"bar":"baz"},"beep":"bip"}
*
* @method utils.deepFillIn
* @param {Object} dest The destination object.
* @param {Object} source The source object.
* @see utils.fillIn
* @see utils.deepMixIn
* @since 3.0.0
*/
deepFillIn (dest, source) {
if (source) {
utils.forOwn(source, function (value, key) {
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepFillIn(existing, value)
} else if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
}
return dest
},
/**
* Recursively shallow copy own enumerable properties from `source` to `dest`.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: { bar: 'baz' }, beep: 'boop' }
* const b = { beep: 'bip' }
* utils.deepFillIn(b, a)
* console.log(b) // {"foo":{"bar":"baz"},"beep":"boop"}
*
* @method utils.deepMixIn
* @param {Object} dest The destination object.
* @param {Object} source The source object.
* @see utils.fillIn
* @see utils.deepFillIn
* @since 3.0.0
*/
deepMixIn (dest, source) {
if (source) {
utils.forOwn(source, function (value, key) {
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepMixIn(existing, value)
} else {
dest[key] = value
}
})
}
return dest
},
/**
* Return a diff of the base object to the comparison object.
*
* @example
* import {utils} from 'js-data'
* const oldObject = { foo: 'bar', a: 1234 }
* const newObject = { beep: 'boop', a: 5678 }
* const diff = utils.diffObjects(oldObject, newObject)
* console.log(diff.added) // {"beep":"boop"}
* console.log(diff.changed) // {"a":5678}
* console.log(diff.removed) // {"foo":undefined}
*
* @method utils.diffObjects
* @param {Object} newObject Comparison object.
* @param {Object} oldObject Base object.
* @param {Object} [opts] Configuration options.
* @param {Function} [opts.equalsFn={@link utils.deepEqual}] Equality function.
* @param {Array} [opts.ignore=[]] Array of strings or RegExp of fields to ignore.
* @returns {Object} The diff from the base object to the comparison object.
* @see utils.areDifferent
* @since 3.0.0
*/
diffObjects (newObject, oldObject, opts) {
opts || (opts = {})
let equalsFn = opts.equalsFn
let blacklist = opts.ignore
const diff = {
added: {},
changed: {},
removed: {}
}
if (!utils.isFunction(equalsFn)) {
equalsFn = utils.deepEqual
}
const newKeys = Object.keys(newObject).filter(function (key) {
return !utils.isBlacklisted(key, blacklist)
})
const oldKeys = Object.keys(oldObject).filter(function (key) {
return !utils.isBlacklisted(key, blacklist)
})
// Check for properties that were added or changed
newKeys.forEach(function (key) {
const oldValue = oldObject[key]
const newValue = newObject[key]
if (equalsFn(oldValue, newValue)) {
return
}
if (utils.isUndefined(oldValue)) {
diff.added[key] = newValue
} else {
diff.changed[key] = newValue
}
})
// Check for properties that were removed
oldKeys.forEach(function (key) {
const oldValue = oldObject[key]
const newValue = newObject[key]
if (utils.isUndefined(newValue) && !utils.isUndefined(oldValue)) {
diff.removed[key] = undefined
}
})
return diff
},
/**
* Return whether the two values are equal according to the `==` operator.
*
* @example
* import {utils} from 'js-data'
* console.log(utils.equal(1,1)) // true
* console.log(utils.equal(1,'1')) // true
* console.log(utils.equal(93, 66)) // false
*
* @method utils.equal
* @param {*} a First value in the comparison.
* @param {*} b Second value in the comparison.
* @returns {boolean} Whether the two values are equal according to `==`.
* @since 3.0.0
*/
equal (a, b) {
return a == b // eslint-disable-line
},
/**
* Produce a factory function for making Error objects with the provided
* metadata. Used throughout the various js-data components.
*
* @example
* import {utils} from 'js-data'
* const errorFactory = utils.err('domain', 'target')
* const error400 = errorFactory(400, 'expected type', 'actual type')
* console.log(error400) // [Error: [domain:target] expected: expected type, found: string
http://www.js-data.io/v3.0/docs/errors#400]
* @method utils.err
* @param {string} domain Namespace.
* @param {string} target Target.
* @returns {Function} Factory function.
* @since 3.0.0
*/
err (domain, target) {
return function (code) {
const prefix = `[${domain}:${target}] `
let message = ERRORS[code].apply(null, Array.prototype.slice.call(arguments, 1))
message = `${prefix}${message}
http://www.js-data.io/v3.0/docs/errors#${code}`
return new Error(message)
}
},
/**
* Add eventing capabilities into the target object.
*
* @example
* import {utils} from 'js-data'
* const user = { name: 'John' }
* utils.eventify(user)
* user.on('foo', () => console.log(arguments))
* user.emit('foo', 1, 'bar') // should log to console values (1, "bar")
*
* @method utils.eventify
* @param {Object} target Target object.
* @param {Function} [getter] Custom getter for retrieving the object's event
* listeners.
* @param {Function} [setter] Custom setter for setting the object's event
* listeners.
* @since 3.0.0
*/
eventify (target, getter, setter) {
target = target || this
let _events = {}
if (!getter && !setter) {
getter = function () { return _events }
setter = function (value) { _events = value }
}
Object.defineProperties(target, {
emit: {
value (...args) {
const events = getter.call(this) || {}
const type = args.shift()
let listeners = events[type] || []
let i
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
listeners = events.all || []
args.unshift(type)
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
}
},
off: {
value (type, func) {
const events = getter.call(this)
const listeners = events[type]
if (!listeners) {
setter.call(this, {})
} else if (func) {
for (let i = 0; i < listeners.length; i++) {
if (listeners[i].f === func) {
listeners.splice(i, 1)
break
}
}
} else {
listeners.splice(0, listeners.length)
}
}
},
on: {
value (type, func, thisArg) {
if (!getter.call(this)) {
setter.call(this, {})
}
const events = getter.call(this)
events[type] = events[type] || []
events[type].push({
c: thisArg,
f: func
})
}
}
})
},
/**
* Used for sublcassing. Invoke this method in the context of a superclass to
* to produce a subclass based on `props` and `classProps`.
*
* @example
* import {utils} from 'js-data'
* function Animal () {}
* Animal.extend = utils.extend
* const Cat = Animal.extend({
* say () {
* console.log('meow')
* }
* })
* const cat = new Cat()
* cat instanceof Animal // true
* cat instanceof Cat // true
* cat.say() // "meow"
*
* @method utils.extend
* @param {Object} props Instance properties for the subclass.
* @param {Object} [props.constructor] Provide a custom constructor function
* to use as the subclass.
* @param {Object} props Static properties for the subclass.
* @returns {Constructor} A new subclass.
* @since 3.0.0
*/
extend (props, classProps) {
const superClass = this
let subClass
props || (props = {})
classProps || (classProps = {})
if (props.hasOwnProperty('constructor')) {
subClass = props.constructor
delete props.constructor
} else {
subClass = function (...args) {
utils.classCallCheck(this, subClass)
superClass.apply(this, args)
}
}
// Setup inheritance of instance members
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
configurable: true,
enumerable: false,
value: subClass,
writable: true
}
})
const obj = Object
// Setup inheritance of static members
if (obj.setPrototypeOf) {
obj.setPrototypeOf(subClass, superClass)
} else if (classProps.strictEs6Class) {
subClass.__proto__ = superClass // eslint-disable-line
} else {
utils.forOwn(superClass, function (value, key) {
subClass[key] = value
})
}
if (!subClass.hasOwnProperty('__super__')) {
Object.defineProperty(subClass, '__super__', {
configurable: true,
value: superClass
})
}
utils.addHiddenPropsToTarget(subClass.prototype, props)
utils.fillIn(subClass, classProps)
return subClass
},
/**
* Shallow copy own enumerable properties from `src` to `dest` that are on
* `src` but are missing from `dest.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: 'bar', beep: 'boop' }
* const b = { beep: 'bip' }
* utils.fillIn(b, a)
* console.log(b) // {"foo":"bar","beep":"bip"}
*
* @method utils.fillIn
* @param {Object} dest The destination object.
* @param {Object} source The source object.
* @see utils.deepFillIn
* @see utils.deepMixIn
* @since 3.0.0
*/
fillIn (dest, src) {
utils.forOwn(src, function (value, key) {
if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
},
/**
* Find the last index of an item in an array according to the given checker function.
*
* @example
* import {utils} from 'js-data'
*
* const john = { name: 'John', age: 20 }
* const sara = { name: 'Sara', age: 25 }
* const dan = { name: 'Dan', age: 20 }
* const users = [john, sara, dan]
*
* console.log(utils.findIndex(users, (user) => user.age === 25)) // 1
* console.log(utils.findIndex(users, (user) => user.age > 19)) // 2
* console.log(utils.findIndex(users, (user) => user.name === 'John')) // 0
* console.log(utils.findIndex(users, (user) => user.name === 'Jimmy')) // -1
*
* @method utils.findIndex
* @param {Array} array The array to search.
* @param {Function} fn Checker function.
* @returns {number} Index if found or -1 if not found.
* @since 3.0.0
*/
findIndex (array, fn) {
let index = -1
if (!array) {
return index
}
array.forEach(function (record, i) {
if (fn(record)) {
index = i
return false
}
})
return index
},
/**
* Recursively iterate over a {@link Mapper}'s relations according to
* `opts.with`.
*
* @method utils.forEachRelation
* @param {Mapper} mapper Mapper.
* @param {Object} opts Configuration options.
* @param {Function} fn Callback function.
* @param {*} thisArg Execution context for the callback function.
* @since 3.0.0
*/
forEachRelation (mapper, opts, fn, thisArg) {
const relationList = mapper.relationList || []
if (!relationList.length) {
return
}
relationList.forEach(function (def) {
utils._forRelation(opts, def, fn, thisArg)
})
},
/**
* Iterate over an object's own enumerable properties.
*
* @example
* import {utils} from 'js-data'
* const a = { b: 1, c: 4 }
* let sum = 0
* utils.forOwn(a, function (value, key) {
* sum += value
* })
* console.log(sum) // 5
*
* @method utils.forOwn
* @param {Object} object The object whose properties are to be enumerated.
* @param {Function} fn Iteration function.
* @param {Object} [thisArg] Content to which to bind `fn`.
* @since 3.0.0
*/
forOwn (obj, fn, thisArg) {
const keys = Object.keys(obj)
const len = keys.length
let i
for (i = 0; i < len; i++) {
fn.call(thisArg, obj[keys[i]], keys[i], obj)
}
},
/**
* Proxy for `JSON.parse`.
*
* @example
* import {utils} from 'js-data'
*
* const a = utils.fromJson('{"name" : "John"}')
* console.log(a) // { name: 'John' }
*
* @method utils.fromJson
* @param {string} json JSON to parse.
* @returns {Object} Parsed object.
* @see utils.toJson
* @since 3.0.0
*/
fromJson (json) {
return utils.isString(json) ? JSON.parse(json) : json
},
/**
* Retrieve the specified property from the given object. Supports retrieving
* nested properties.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: { bar: 'baz' }, beep: 'boop' }
* console.log(utils.get(a, 'beep')) // "boop"
* console.log(utils.get(a, 'foo.bar')) // "baz"
*
* @method utils.get
* @param {Object} object Object from which to retrieve a property's value.
* @param {string} prop Property to retrieve.
* @returns {*} Value of the specified property.
* @see utils.set
* @since 3.0.0
*/
'get': function (object, prop) {
if (!prop) {
return
}
const parts = prop.split('.')
const last = parts.pop()
while (prop = parts.shift()) { // eslint-disable-line
object = object[prop]
if (object == null) { // eslint-disable-line
return
}
}
return object[last]
},
/**
* Return the superclass for the given instance or subclass. If an instance is
* provided, then finds the parent class of the instance's constructor.
*
* @example
* import {utils} from 'js-data'
* // using ES2015 classes
* class Foo {}
* class Bar extends Foo {}
* const barInstance = new Bar()
* let baseType = utils.getSuper(barInstance)
* console.log(Foo === baseType) // true
*
* // using Function constructor with utils.extend
* function Foo () {}
* Foo.extend = utils.extend
* const Bar = Foo.extend()
* const barInstance = new Bar()
* let baseType = utils.getSuper(barInstance)
* console.log(Foo === baseType) // true
*
* @method utils.getSuper
* @param {Object|Function} instance Instance or constructor.
* @param {boolean} [isCtor=false] Whether `instance` is a constructor.
* @returns {Constructor} The superclass (grandparent constructor).
* @since 3.0.0
*/
getSuper (instance, isCtor) {
const ctor = isCtor ? instance : instance.constructor
if (ctor.hasOwnProperty('__super__')) {
return ctor.__super__
}
return Object.getPrototypeOf(ctor) || ctor.__proto__ // eslint-disable-line
},
/**
* Return the intersection of two arrays.
*
* @example
* import {utils} from 'js-data'
* const arrA = ['green', 'red', 'blue', 'red']
* const arrB = ['green', 'yellow', 'red']
* const intersected = utils.intersection(arrA, arrB)
*
* console.log(intersected) // ['green', 'red'])
*
* @method utils.intersection
* @param {Array} array1 First array.
* @param {Array} array2 Second array.
* @returns {Array} Array of elements common to both arrays.
* @since 3.0.0
*/
intersection (array1, array2) {
if (!array1 || !array2) {
return []
}
const result = []
let item
let i
const len = array1.length
for (i = 0; i < len; i++) {
item = array1[i]
if (result.indexOf(item) !== -1) {
continue
}
if (array2.indexOf(item) !== -1) {
result.push(item)
}
}
return result
},
/**
* Proxy for `Array.isArray`.
*
* @example
* import {utils} from 'js-data'
* const a = [1,2,3,4,5]
* const b = { foo: "bar" }
* console.log(utils.isArray(a)) // true
* console.log(utils.isArray(b)) // false
*
* @method utils.isArray
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an array.
* @since 3.0.0
*/
isArray: Array.isArray,
/**
* Return whether `prop` is matched by any string or regular expression in
* `blacklist`.
*
* @example
* import {utils} from 'js-data'
* const blacklist = [/^\$hashKey/g, /^_/g, 'id']
* console.log(utils.isBlacklisted("$hashKey", blacklist)) // true
* console.log(utils.isBlacklisted("id", blacklist)) // true
* console.log(utils.isBlacklisted("_myProp", blacklist)) // true
* console.log(utils.isBlacklisted("my_id", blacklist)) // false
*
* @method utils.isBlacklisted
* @param {string} prop The name of a property to check.
* @param {Array} blacklist Array of strings and regular expressions.
* @returns {boolean} Whether `prop` was matched.
* @since 3.0.0
*/
isBlacklisted (prop, blacklist) {
if (!blacklist || !blacklist.length) {
return false
}
let matches
for (var i = 0; i < blacklist.length; i++) {
if ((toStr(blacklist[i]) === REGEXP_TAG && blacklist[i].test(prop)) || blacklist[i] === prop) {
matches = prop
return !!matches
}
}
return !!matches
},
/**
* Return whether the provided value is a boolean.
*
* @example
* import {utils} from 'js-data'
* const a = true
* const b = { foo: "bar" }
* console.log(utils.isBoolean(a)) // true
* console.log(utils.isBoolean(b)) // false
*
* @method utils.isBoolean
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a boolean.
* @since 3.0.0
*/
isBoolean (value) {
return toStr(value) === BOOL_TAG
},
/**
* Return whether the provided value is a date.
*
* @example
* import {utils} from 'js-data'
* const a = new Date()
* const b = { foo: "bar" }
* console.log(utils.isDate(a)) // true
* console.log(utils.isDate(b)) // false
*
* @method utils.isDate
* @param {*} value The value to test.
* @returns {Date} Whether the provided value is a date.
* @since 3.0.0
*/
isDate (value) {
return (value && typeof value === 'object' && toStr(value) === DATE_TAG)
},
/**
* Return whether the provided value is a function.
*
* @example
* import {utils} from 'js-data'
* const a = function (){ console.log('foo bar')}
* const b = { foo: "bar" }
* console.log(utils.isFunction(a)) // true
* console.log(utils.isFunction(b)) // false
*
* @method utils.isFunction
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a function.
* @since 3.0.0
*/
isFunction (value) {
return typeof value === 'function' || (value && toStr(value) === FUNC_TAG)
},
/**
* Return whether the provided value is an integer.
*
* @example
* import {utils} from 'js-data'
* const a = 1
* const b = 1.25
* const c = '1'
* console.log(utils.isInteger(a)) // true
* console.log(utils.isInteger(b)) // false
* console.log(utils.isInteger(c)) // false
*
* @method utils.isInteger
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an integer.
* @since 3.0.0
*/
isInteger (value) {
return toStr(value) === NUMBER_TAG && value == toInteger(value) // eslint-disable-line
},
/**
* Return whether the provided value is `null`.
*
* @example
* import {utils} from 'js-data'
* const a = null
* const b = { foo: "bar" }
* console.log(utils.isNull(a)) // true
* console.log(utils.isNull(b)) // false
*
* @method utils.isNull
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is `null`.
* @since 3.0.0
*/
isNull (value) {
return value === null
},
/**
* Return whether the provided value is a number.
*
* @example
* import {utils} from 'js-data'
* const a = 1
* const b = -1.25
* const c = '1'
* console.log(utils.isNumber(a)) // true
* console.log(utils.isNumber(b)) // true
* console.log(utils.isNumber(c)) // false
*
* @method utils.isNumber
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a number.
* @since 3.0.0
*/
isNumber (value) {
const type = typeof value
return type === 'number' || (value && type === 'object' && toStr(value) === NUMBER_TAG)
},
/**
* Return whether the provided value is an object.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: "bar" }
* const b = 'foo bar'
* console.log(utils.isObject(a)) // true
* console.log(utils.isObject(b)) // false
*
* @method utils.isObject
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an object.
* @since 3.0.0
*/
isObject (value) {
return toStr(value) === OBJECT_TAG
},
/**
* Return whether the provided value is a regular expression.
*
* @example
* import {utils} from 'js-data'
* const a = /^\$.+$/ig
* const b = new RegExp('^\$.+$', 'ig')
* const c = { foo: "bar" }
* console.log(utils.isRegExp(a)) // true
* console.log(utils.isRegExp(b)) // true
* console.log(utils.isRegExp(c)) // false
*
* @method utils.isRegExp
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a regular expression.
* @since 3.0.0
*/
isRegExp (value) {
return toStr(value) === REGEXP_TAG
},
/**
* Return whether the provided value is a string or a number.
*
* @example
* import {utils} from 'js-data'
* console.log(utils.isSorN('')) // true
* console.log(utils.isSorN(-1.65)) // true
* console.log(utils.isSorN('my string')) // true
* console.log(utils.isSorN({})) // false
* console.log(utils.isSorN([1,2,4])) // false
*
* @method utils.isSorN
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a string or a number.
* @since 3.0.0
*/
isSorN (value) {
return utils.isString(value) || utils.isNumber(value)
},
/**
* Return whether the provided value is a string.
*
* @example
* import {utils} from 'js-data'
* console.log(utils.isString('')) // true
* console.log(utils.isString('my string')) // true
* console.log(utils.isString(100)) // false
* console.log(utils.isString([1,2,4])) // false
*
* @method utils.isString
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a string.
* @since 3.0.0
*/
isString (value) {
return typeof value === 'string' || (value && typeof value === 'object' && toStr(value) === STRING_TAG)
},
/**
* Return whether the provided value is a `undefined`.
*
* @example
* import {utils} from 'js-data'
* const a = undefined
* const b = { foo: "bar"}
* console.log(utils.isUndefined(a)) // true
* console.log(utils.isUndefined(b.baz)) // true
* console.log(utils.isUndefined(b)) // false
* console.log(utils.isUndefined(b.foo)) // false
*
* @method utils.isUndefined
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a `undefined`.
* @since 3.0.0
*/
isUndefined (value) {
return value === undefined
},
/**
* Mix in logging capabilities to the target.
*
* @example
* import {utils} from 'js-data'
* const a = { foo: "bar"}
*
* // Add standard logging to an object
* utils.logify(a)
* a.log('info', 'test log info') // output 'test log info' to console.
*
* // Toggle debug output of an object
* a.dbg('test debug output') // does not output because debug is off.
* a.debug = true
* a.dbg('test debug output') // output 'test debug output' to console.
*
* @method utils.logify
* @param {*} target The target.
* @since 3.0.0
*/
logify (target) {
utils.addHiddenPropsToTarget(target, {
dbg (...args) {
this.log('debug', ...args)
},
log (level, ...args) {
if (level && !args.length) {
args.push(level)
level = 'debug'
}
if (level === 'debug' && !this.debug) {
return
}
const prefix = `${level.toUpperCase()}: (${this.name || this.constructor.name})`
if (utils.isFunction(console[level])) {
console[level](prefix, ...args)
} else {
console.log(prefix, ...args)
}
}
})
},
/**
* Adds the given record to the provided array only if it's not already in the
* array.
*
* @example
* import {utils} from 'js-data'
* const colors = ['red', 'green', 'yellow']
*
* console.log(colors.length) // 3
* utils.noDupeAdd(colors, 'red')
* console.log(colors.length) // 3, red already exists
*
* utils.noDupeAdd(colors, 'blue')
* console.log(colors.length) // 4, blue was added
*
* @method utils.noDupeAdd
* @param {Array} array The array.
* @param {*} record The value to add.
* @param {Function} fn Callback function passed to {@link utils.findIndex}.
* @since 3.0.0
*/
noDupeAdd (array, record, fn) {
if (!array) {
return
}
const index = this.findIndex(array, fn)
if (index < 0) {
array.push(record)
}
},
/**
* Return a shallow copy of the provided object, minus the properties
* specified in `keys`.
*
* @example
* import {utils} from 'js-data'
* const a = { name: 'John', $hashKey: 1214910 }
*
* let b = utils.omit(a, ['$hashKey'])
* console.log(b) // { name: 'John' }
*
* @method utils.omit
* @param {Object} props The object to copy.
* @param {string[]} keys Array of strings, representing properties to skip.
* @returns {Object} Shallow copy of `props`, minus `keys`.
* @since 3.0.0
*/
omit (props, keys) {
const _props = {}
utils.forOwn(props, function (value, key) {
if (keys.indexOf(key) === -1) {
_props[key] = value
}
})
return _props
},
/**
* Return a shallow copy of the provided object, but only include the
* properties specified in `keys`.
*
* @example
* import {utils} from 'js-data'
* const a = { name: 'John', $hashKey: 1214910 }
*
* let b = utils.pick(a, ['$hashKey'])
* console.log(b) // { $hashKey: 1214910 }
*
* @method utils.pick
* @param {Object} props The object to copy.
* @param {string[]} keys Array of strings, representing properties to keep.
* @returns {Object} Shallow copy of `props`, but only including `keys`.
* @since 3.0.0
*/
pick (props, keys) {
const _props = {}
utils.forOwn(props, function (value, key) {
if (keys.indexOf(key) !== -1) {
_props[key] = value
}
})
return _props
},
/**
* Return a plain copy of the given value.
*
* @example
* import {utils} from 'js-data'
* const a = { name: 'John' }
* let b = utils.plainCopy(a)
* console.log(a === b) // false
*
* @method utils.plainCopy
* @param {*} value The value to copy.
* @returns {*} Plain copy of `value`.
* @see utils.copy
* @since 3.0.0
*/
plainCopy (value) {
return utils.copy(value, undefined, undefined, undefined, undefined, true)
},
/**
* Shortcut for `utils.Promise.reject(value)`.
*
* @example
* import {utils} from 'js-data'
*
* utils.reject("Testing static reject").then(function(data) {
* // not called
* }).catch(function(reason) {
* console.log(reason); // "Testing static reject"
* })
*
* @method utils.reject
* @param {*} [value] Value with which to reject the Promise.
* @returns {Promise} Promise reject with `value`.
* @see utils.Promise
* @since 3.0.0
*/
reject (value) {
return utils.Promise.reject(value)
},
/**
* Remove the last item found in array according to the given checker function.
*
* @example
* import {utils} from 'js-data'
*
* const colors = ['red', 'green', 'yellow', 'red']
* utils.remove(colors, (color) => color === 'red')
* console.log(colors) // ['red', 'green', 'yellow']
*
* @method utils.remove
* @param {Array} array The array to search.
* @param {Function} fn Checker function.
*/
remove (array, fn) {
if (!array || !array.length) {
return
}
const index = this.findIndex(array, fn)
if (index >= 0) {
array.splice(index, 1) // todo should this be recursive?
}
},
/**
* Shortcut for `utils.Promise.resolve(value)`.
*
* @example
* import {utils} from 'js-data'
*
* utils.resolve("Testing static resolve").then(function(data) {
* console.log(data); // "Testing static resolve"
* }).catch(function(reason) {
* // not called
* })
*
* @param {*} [value] Value with which to resolve the Promise.
* @returns {Promise} Promise resolved with `value`.
* @see utils.Promise
* @since 3.0.0
*/
resolve (value) {
return utils.Promise.resolve(value)
},
/**
* Set the value at the provided key or path.
*
* @example
* import {utils} from 'js-data'
*
* const john = {
* name: 'John',
* age: 25,
* parent: {
* name: 'John's Mom',
* age: 50
* }
* }
* // set value by key
* utils.set(john, 'id', 98)
* console.log(john.id) // 98
*
* // set value by path
* utils.set(john, 'parent.id', 20)
* console.log(john.parent.id) // 20
*
* // set value by path/value map
* utils.set(john, {
* 'id': 1098,
* 'parent': { id: 1020 },
* 'parent.age': '55'
* })
* console.log(john.id) // 1098
* console.log(john.parent.id) // 1020
* console.log(john.parent.age) // 55
*
* @method utils.set
* @param {Object} object The object on which to set a property.
* @param {(string|Object)} path The key or path to the property. Can also
* pass in an object of path/value pairs, which will all be set on the target
* object.
* @param {*} [value] The value to set.
*/
set: function (object, path, value) {
if (utils.isObject(path)) {
utils.forOwn(path, function (value, _path) {
utils.set(object, _path, value)
})
} else {
const parts = PATH.exec(path)
if (parts) {
mkdirP(object, parts[1])[parts[2]] = value
} else {
object[path] = value
}
}
},
/**
* Check whether the two provided objects are deeply equal.
*
* @example
* import {utils} from 'js-data'
*
* const objA = {
* name: 'John',
* id: 27,
* nested: {
* item: 'item 1',
* colors: ['red', 'green', 'blue']
* }
* }
*
* const objB = {
* name: 'John',
* id: 27,
* nested: {
* item: 'item 1',
* colors: ['red', 'green', 'blue']
* }
* }
*
* console.log(utils.deepEqual(a,b)) // true
* objB.nested.colors.add('yellow') // make a change to a nested object's array
* console.log(utils.deepEqual(a,b)) // false
*
* @method utils.deepEqual
* @param {Object} a First object in the comparison.
* @param {Object} b Second object in the comparison.
* @returns {boolean} Whether the two provided objects are deeply equal.
* @see utils.equal
* @since 3.0.0
*/
deepEqual (a, b) {
if (a === b) {
return true
}
let _equal = true
if (utils.isObject(a) && utils.isObject(b)) {
utils.forOwn(a, function (value, key) {
_equal = _equal && utils.deepEqual(value, b[key])
})
if (!_equal) {
return _equal
}
utils.forOwn(b, function (value, key) {
_equal = _equal && utils.deepEqual(value, a[key])
})
} else if (utils.isArray(a) && utils.isArray(b)) {
a.forEach(function (value, i) {
_equal = _equal && utils.deepEqual(value, b[i])
if (!_equal) {
return false
}
})
} else {
return false
}
return _equal
},
/**
* Proxy for `JSON.stringify`.
*
* @example
* import {utils} from 'js-data'
*
* const a = { name: 'John' }
* let jsonVal = utils.toJson(a)
* console.log(jsonVal) // '{"name" : "John"}'
*
* @method utils.toJson
* @param {*} value Value to serialize to JSON.
* @returns {string} JSON string.
* @see utils.fromJson
* @since 3.0.0
*/
toJson: JSON.stringify,
/**
* Unset the value at the provided key or path.
*
* @example
* import {utils} from 'js-data'
*
* const john = {
* name: 'John',
* age: 25,
* parent: {
* name: 'John's Mom',
* age: 50
* }
* }
*
* utils.unset(john, age)
* utils.unset(john, parent.age)
*
* console.log(john.age) // null
* console.log(john.parent.age) // null
*
* @method utils.unset
* @param {Object} object The object from which to delete the property.
* @param {string} path The key or path to the property.
* @see utils.set
* @since 3.0.0
*/
unset (object, path) {
const parts = path.split('.')
const last = parts.pop()
while (path = parts.shift()) { // eslint-disable-line
object = object[path]
if (object == null) { // eslint-disable-line
return
}
}
object[last] = undefined
}
}
export default utils
js-data