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 objectjavascript assign
const obj = { a: 1 };
const copy = Object.assign({}, obj);
console.log(copy); // { a: 1 }javascript object.assign
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 }object.assign react js
'use strict';
// Merge an object
let first = {name: 'Tony'};
let last = {lastName: 'Stark'};
let person = Object.assign(first, last);
ChromeSamples.log(person);
// {name: 'Tony', lastName: 'Stark'}
ChromeSamples.log(first);
// first = {name: 'Tony', lastName: 'Stark'} as the target also changed
// Merge multiple sources
let a = Object.assign({foo: 0}, {bar: 1}, {baz: 2});
ChromeSamples.log(a);
// {foo: 0, bar: 1, baz: 2}
// Merge and overwrite equal keys
let b = Object.assign({foo: 0}, {foo: 1}, {foo: 2});
ChromeSamples.log(b);
// {foo: 2}
// Clone an object
let obj = {person: 'Thor Odinson'};
let samp = {person: 'ashok'};
let clone = Object.assign({}, obj, samp);
ChromeSamples.log(clone);
// {person: 'Thor Odinson'}mdn 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',
}
*/Copyright © 2021 Codeinu
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