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How to create deep object with dynamic name in Javascript?

What are good ways to create a copy of an object in javascript?

  • I need to create a copy of a JSON object. Methods like Object.create(), new Object() didnt help me. the new objects created using these methods always takes the reference of the original object

  • Answer:

    I've developed quite a few webapps and I must tell you that I only wanted to copy entire json objects when I was a beginner. There are very few cases when you actually have to do this. If you are using jquery, $.extend with a recursive parameter set to true will do the trick. Basically you have to iterate over each key in the json object, and if the key is a primitive type just copy that value with normal attribution (=). If the key is an object itself assign to the key of the resulting object the result of calling the same copy function again on the sub object that you are iterating over. This is a pretty boring code. Jquery and extjs offer the extend method for this.

Vlad Nicula at Quora Visit the source

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ES6 feature Object.prototype.assign() It is used to copy all of the "own" properties from source object(s) on to a target object. So it won't copy any properties that are inherited from an object's prototype. Usage: let sourceObj = { a: 12, b(x) { return x *x }, c: "Some string" } let targetObj = {}; let clone = Object.assign({}, sourceObj); console.log(targetObj === clone); // true https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

Ryan Tomczik

boring code： function clone(obj) { if (null == obj || "object" != typeof obj) return obj; var copy = obj.constructor(); for (var attr in obj) { if (obj.hasOwnProperty(attr)) { if (Object.getOwnPropertyDescriptor(obj, attr).value instanceof Object) { copy[attr] = clone(obj[attr]); } else { Object.defineProperty(copy, attr, Object.getOwnPropertyDescriptor(obj,attr)); } } } return copy; }

Cai Yiheng

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