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 object
javascript 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', } */
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