mirror of
https://github.com/whoisclebs/lodash.git
synced 2026-02-01 07:47:49 +00:00
110 lines
3.5 KiB
JavaScript
110 lines
3.5 KiB
JavaScript
/**
|
|
* lodash 3.0.4 (Custom Build) <https://lodash.com/>
|
|
* Build: `lodash modern modularize exports="npm" -o ./`
|
|
* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
|
|
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
|
|
* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
|
|
* Available under MIT license <https://lodash.com/license>
|
|
*/
|
|
var arrayEach = require('lodash._arrayeach'),
|
|
baseCallback = require('lodash._basecallback'),
|
|
baseCreate = require('lodash._basecreate'),
|
|
baseFor = require('lodash._basefor'),
|
|
isArray = require('lodash.isarray'),
|
|
isFunction = require('lodash.isfunction'),
|
|
isTypedArray = require('lodash.istypedarray'),
|
|
keys = require('lodash.keys');
|
|
|
|
/**
|
|
* The base implementation of `_.forOwn` without support for callback
|
|
* shorthands and `this` binding.
|
|
*
|
|
* @private
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @returns {Object} Returns `object`.
|
|
*/
|
|
function baseForOwn(object, iteratee) {
|
|
return baseFor(object, iteratee, keys);
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
|
|
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is an object, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObject({});
|
|
* // => true
|
|
*
|
|
* _.isObject([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isObject(1);
|
|
* // => false
|
|
*/
|
|
function isObject(value) {
|
|
// Avoid a V8 JIT bug in Chrome 19-20.
|
|
// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
|
|
var type = typeof value;
|
|
return !!value && (type == 'object' || type == 'function');
|
|
}
|
|
|
|
/**
|
|
* An alternative to `_.reduce`; this method transforms `object` to a new
|
|
* `accumulator` object which is the result of running each of its own enumerable
|
|
* properties through `iteratee`, with each invocation potentially mutating
|
|
* the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked
|
|
* with four arguments: (accumulator, value, key, object). Iteratee functions
|
|
* may exit iteration early by explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Object
|
|
* @param {Array|Object} object The object to iterate over.
|
|
* @param {Function} [iteratee=_.identity] The function invoked per iteration.
|
|
* @param {*} [accumulator] The custom accumulator value.
|
|
* @param {*} [thisArg] The `this` binding of `iteratee`.
|
|
* @returns {*} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* _.transform([2, 3, 4], function(result, n) {
|
|
* result.push(n *= n);
|
|
* return n % 2 == 0;
|
|
* });
|
|
* // => [4, 9]
|
|
*
|
|
* _.transform({ 'a': 1, 'b': 2 }, function(result, n, key) {
|
|
* result[key] = n * 3;
|
|
* });
|
|
* // => { 'a': 3, 'b': 6 }
|
|
*/
|
|
function transform(object, iteratee, accumulator, thisArg) {
|
|
var isArr = isArray(object) || isTypedArray(object);
|
|
iteratee = baseCallback(iteratee, thisArg, 4);
|
|
|
|
if (accumulator == null) {
|
|
if (isArr || isObject(object)) {
|
|
var Ctor = object.constructor;
|
|
if (isArr) {
|
|
accumulator = isArray(object) ? new Ctor : [];
|
|
} else {
|
|
accumulator = baseCreate(isFunction(Ctor) ? Ctor.prototype : undefined);
|
|
}
|
|
} else {
|
|
accumulator = {};
|
|
}
|
|
}
|
|
(isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
|
|
return iteratee(accumulator, value, index, object);
|
|
});
|
|
return accumulator;
|
|
}
|
|
|
|
module.exports = transform;
|