var myObject = { 'a': 1, 'b': 2, 'c': 3 }; Object.keys(myObject).map(function(key, index) { myObject[key] *= 2; }); console.log(myObject); // => { 'a': 2, 'b': 4, 'c': 6 }
Object.entries(obj).forEach(([key, value]) => { console.log(key, value); });
const object1 = { a: 'somestring', b: 42 }; for (let [key, value] of Object.entries(object1)) { console.log(`${key}: ${value}`); } // expected output: // "a: somestring" // "b: 42" // order is not guaranteed
var myObject = { 'a': 1, 'b': 2, 'c': 3 }; for (var key in myObject) { if (myObject.hasOwnProperty(key)) { myObject[key] *= 2; } } console.log(myObject); // { 'a': 2, 'b': 4, 'c': 6 }
const object1 = { a: 'some string', b: 42 }; for (let [key, value] of Object.entries(object1)) { console.log(`${key}: ${value}`); } // expected output: // "a: some string" // "b: 42" // order is not guaranteed
const objectMap = (obj, fn) => Object.fromEntries( Object.entries(obj).map( ([k, v], i) => [k, fn(v, k, i)] ) ) const myObject = { a: 1, b: 2, c: 3 } console.log(objectMap(myObject, v => 2 * v));