copy object javascript
var x = {myProp: "value"};
var y = Object.assign({}, x);copy object javascript
var x = {myProp: "value"};
var y = Object.assign({}, x);copy object javascript
// es6
const obj = {name: 'john', surname: 'smith'};
const objCopy = {...obj};copy object javascript
var x = {key: 'value'}
var y = JSON.parse(JSON.stringify(x))
//this method actually creates a reference-free version of the object, unlike the other methods
//If you do not use Dates, functions, undefined, regExp or Infinity within your objectmdn object assign
The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the target object.
const target = { a: 1, b: 2 };
const source = { b: 4, c: 5 };
const returnedTarget = Object.assign(target, source);
console.log(target);
// expected output: Object { a: 1, b: 4, c: 5 }
console.log(returnedTarget);
// expected output: Object { a: 1, b: 4, c: 5 }copy an object with object.assign
// We want to update status property value to 'online'
const data = {
user: 'CamperBot',
status: 'offline',
friends: '732,982',
};
// Object.assign takes in a target object (1st parameter) and source objects
// (rest of the parameter list). Source object properties are mapped to the
// target object (which is usually empty). Any matching properties are
// overwritten by the source objects
const newObject = Object.assign({}, data, {status: 'online'})
console.log(newObject)
/*
{
user: 'CamperBot',
status: 'online',
friends: '732,982',
}
*/clone an object javascript
//returns a copy of the object
function clone(obj) {
if (null == obj || "object" != typeof obj) return obj;
var copy = obj.constructor();
for (var attr in obj) {
if (obj.hasOwnProperty(attr)) copy[attr] = obj[attr];
}
return copy;
}Copyright © 2021 Codeinu
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