JavaScript | Object.fromEntries() Method
The Object.fromEntries() method in JavaScript is standard built-in objects which is used to transforms a list of key-value pairs into an object. This method returns a new object whose properties are given by the entries of the iterable
Syntax:
Object.fromEntries( iterable )
Parameters: This method accept single parameter iterable which holds an iterable such as Array or Map or other objects implementing the iterable protocol.
Return value: This method always returns a new object whose properties are given by the entries of the iterable.
Below examples illustrate the Object.fromEntries() method in JavaScript:
Example 1: Conversion of a Map into an Object.
const map1 = new Map([ ['big', 'small'], [1, 0] ]);const geek = Object.fromEntries(map1);console.log(geek); const map2 = new Map( [['Geek1', 'Intern'], ['stipend', 'Works basis']]);const geek1 = Object.fromEntries(map2);console.log(geek1); |
Output:
Object { 1: 0, big: "small" }
Object { Geek1: "Intern", stipend: "Works basis" }Example 2: Conversion of a Array into an Object.
const arr1 = [ ['big', 'small'], [1, 0], ['a', 'z' ]];const geek = Object.fromEntries(arr1);console.log(geek); const arr2 = [ ['Geek1', 'Intern'], ['stipend', 'Works basis'] ];const geek1 = Object.fromEntries(arr2);console.log(geek1); |
Output:
Object { 1: 0, big: "small", a: "z" }
Object { Geek1: "Intern", stipend: "Works basis" }Example 3: Other Conversions
const params = 'type=Get_the Value&geekno;=34&paid;=10';const searchParams = new URLSearchParams(params); console.log(Object.fromEntries(searchParams)); const object1 = { val1: 112, val2: 345, val3: 76 };const object2 = Object.fromEntries( Object.entries(object1) .map(([ key, val ]) => [ key, val * 3 ]));console.log(object2); |
Output:
Object { type: "Get_the Value", geekno: "34", paid: "10" }
Object { val1: 336, val2: 1035, val3: 228 }Supported Browsers: The browsers supported by Object.fromEntries() method are listed below:
- Google Chrome 73 and above
- Firefox 63 and above
- Opera 60 and above
- Safari 12.1 and above
- Edge 79 and above
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