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Deep cloning an object in JS

 3 years ago
source link: https://gist.github.com/EkaterinaaTM/e7fd61be33d4a851131e7933b5a26cc4
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Deep cloning an object in JS · GitHub

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var object_create = Object.create; if (typeof object_create !== 'function') { object_create = function(o) { function F() {} F.prototype = o; return new F(); }; } function deepClone(src) { if(src === null || typeof(src) !== 'object'){ return src; }

//Honor native/custom clone methods if(typeof src.clone == 'function'){ return src.clone(true); }

//Special cases: //Date if(src instanceof Date){ return new Date(src.getTime()); } //RegExp if(src instanceof RegExp){ return new RegExp(src); } //DOM Element if(src.nodeType && typeof src.cloneNode == 'function'){ return src.cloneNode(true); }

//Array if (Object.prototype.toString.call(src) == '[object Array]') { //[].slice() by itself would soft clone var ret = src.slice();

var i = ret.length; while (i--) { ret[i] = deepCopy(ret[i]); } return ret; }

//If we've reached here, we have a regular object var proto = (Object.getPrototypeOf ? Object.getPrototypeOf(src): src.__proto__); var dest = object_create(proto); for (var key in src) { //Note: this does NOT preserve ES5 property attributes like 'writable', 'enumerable', etc. dest[key] = deepCopy(src[key]); } return dest; }


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