mirror of
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113 lines
3.6 KiB
JavaScript
113 lines
3.6 KiB
JavaScript
/**
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* lodash 3.0.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var arrayEach = require('lodash._arrayeach'),
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baseCallback = require('lodash._basecallback'),
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baseCreate = require('lodash._basecreate'),
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baseFor = require('lodash._basefor'),
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isArray = require('lodash.isarray'),
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isTypedArray = require('lodash.istypedarray'),
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keys = require('lodash.keys');
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/**
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* The base implementation of `_.forOwn` without support for callback
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* shorthands and `this` binding.
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*
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* @private
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* @param {Object} object The object to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @returns {Object} Returns `object`.
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*/
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function baseForOwn(object, iteratee) {
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return baseFor(object, iteratee, keys);
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}
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/**
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* Checks if `value` is the language type of `Object`.
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* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
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*
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* **Note:** See the [ES5 spec](https://es5.github.io/#x8) for more details.
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*
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* @static
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* @memberOf _
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an object, else `false`.
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* @example
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*
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* _.isObject({});
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* // => true
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*
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* _.isObject([1, 2, 3]);
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* // => true
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*
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* _.isObject(1);
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* // => false
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*/
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function isObject(value) {
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// Avoid a V8 JIT bug in Chrome 19-20.
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// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
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var type = typeof value;
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return type == 'function' || (value && type == 'object') || false;
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}
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/**
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* An alternative to `_.reduce`; this method transforms `object` to a new
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* `accumulator` object which is the result of running each of its own enumerable
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* properties through `iteratee`, with each invocation potentially mutating
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* the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked
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* with four arguments; (accumulator, value, key, object). Iterator functions
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* may exit iteration early by explicitly returning `false`.
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*
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* @static
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* @memberOf _
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* @category Object
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* @param {Array|Object} object The object to iterate over.
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* @param {Function} [iteratee=_.identity] The function invoked per iteration.
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* @param {*} [accumulator] The custom accumulator value.
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* @param {*} [thisArg] The `this` binding of `iteratee`.
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* @returns {*} Returns the accumulated value.
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* @example
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*
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* var squares = _.transform([1, 2, 3, 4, 5, 6], function(result, n) {
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* n *= n;
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* if (n % 2) {
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* return result.push(n) < 3;
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* }
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* });
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* // => [1, 9, 25]
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*
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* var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) {
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* result[key] = n * 3;
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* });
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* // => { 'a': 3, 'b': 6, 'c': 9 }
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*/
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function transform(object, iteratee, accumulator, thisArg) {
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var isArr = isArray(object) || isTypedArray(object);
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iteratee = baseCallback(iteratee, thisArg, 4);
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if (accumulator == null) {
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if (isArr || isObject(object)) {
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var Ctor = object.constructor;
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if (isArr) {
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accumulator = isArray(object) ? new Ctor : [];
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} else {
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accumulator = baseCreate(typeof Ctor == 'function' && Ctor.prototype);
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}
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} else {
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accumulator = {};
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}
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}
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(isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
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return iteratee(accumulator, value, index, object);
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});
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return accumulator;
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}
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module.exports = transform;
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