56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
var baseClone = require('../internal/baseClone'),
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bindCallback = require('../internal/bindCallback');
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/**
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* Creates a deep clone of `value`. If `customizer` is provided it is invoked
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* to produce the cloned values. If `customizer` returns `undefined` cloning
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* is handled by the method instead. The `customizer` is bound to `thisArg`
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* and invoked with two argument; (value [, index|key, object]).
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*
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* **Note:** This method is loosely based on the
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* [structured clone algorithm](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm).
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* The enumerable properties of `arguments` objects and objects created by
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* constructors other than `Object` are cloned to plain `Object` objects. An
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* empty object is returned for uncloneable values such as functions, DOM nodes,
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* Maps, Sets, and WeakMaps.
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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 deep clone.
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* @param {Function} [customizer] The function to customize cloning values.
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* @param {*} [thisArg] The `this` binding of `customizer`.
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* @returns {*} Returns the deep cloned value.
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* @example
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*
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* var users = [
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* { 'user': 'barney' },
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* { 'user': 'fred' }
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* ];
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*
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* var deep = _.cloneDeep(users);
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* deep[0] === users[0];
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* // => false
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*
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* // using a customizer callback
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* var el = _.cloneDeep(document.body, function(value) {
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* if (_.isElement(value)) {
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* return value.cloneNode(true);
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* }
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* });
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*
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* el === document.body
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* // => false
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* el.nodeName
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* // => BODY
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* el.childNodes.length;
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* // => 20
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*/
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function cloneDeep(value, customizer, thisArg) {
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return typeof customizer == 'function'
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? baseClone(value, true, bindCallback(customizer, thisArg, 1))
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: baseClone(value, true);
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}
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module.exports = cloneDeep;
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