Cloning an Object in Node.js

Question

What is the best way to clone an object in node.js

e.g. I want to avoid the situation where:

var obj1 = {x: 5, y:5};
var obj2 = obj1;
obj2.x = 6;
con         


        

Answer 1

Simple and the fastest way to clone an Object in NodeJS is to use Object.keys( obj ) method

var a = {"a": "a11", "b": "avc"};
var b;

for(var keys = Object.keys(a), l = keys.length; l; --l)
{
   b[ keys[l-1] ] = a[ keys[l-1] ];
}
b.a = 0;

console.log("a: " + JSON.stringify(a)); // LOG: a: {"a":"a11","b":"avc"} 
console.log("b: " + JSON.stringify(b)); // LOG: b: {"a":0,"b":"avc"}

The method Object.keys requires JavaScript 1.8.5; nodeJS v0.4.11 supports this method

but of course for nested objects need to implement recursive func

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Other solution is to use native JSON (Implemented in JavaScript 1.7), but it's much slower (~10 times slower) than previous one

var a = {"a": i, "b": i*i};
var b = JSON.parse(JSON.stringify(a));
b.a = 0;