fox fox - 21 days ago 17
Javascript Question

clone a js object except for one key

I have a flat JS object:

{a: 1, b: 2, c: 3, ..., z:26}


I want to clone the object except for one element:

{a: 1, c: 3, ..., z:26}


What's the easiest way to do this (preferring to use es6/7 if possible)?

Answer

If you use Babel you can use the following syntax to copy property b from x into variable b and then copy rest of properties into variable y:

let x = {a: 1, b: 2, c: 3, z:26};
let {b, ...y} = x;

and it will be transpiled into:

"use strict";

function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }

var x = { a: 1, b: 2, c: 3, z: 26 };
var b = x.b;

var y = _objectWithoutProperties(x, ["b"]);