var person={ "first_name":"Harry", "last_name":"Potter", "age":14 }; var personSize = Object.keys(person).length; //gets number of properties (3)
var myObj = {no:'u',my:'sql'} var keys = Object.keys(myObj);//returnes the array ['no','my'];
// Object Entries returns object as Array of [key,value] Array const object1 = { a: 'somestring', b: 42 } Object.entries(object1) // Array(2) [["a", "something"], ["b", 42]] .forEach(([key, value]) => console.log(`${key}: ${value}`)) // "a: somestring" // "b: 42"
const object1 = { a: 'somestring', b: 42, c: false }; console.log(Object.keys(object1)); // expected output: Array ["a", "b", "c"]
myObject = { "key": "value" } Object.keys(myObject); // get array of keys
const object1 = { a: 'somestring', b: 42, c: false }; console.log(Object.keys(object1));
var buttons = { foo: 'bar', fiz: 'buz' }; for ( var property in buttons ) { console.log( property ); // Outputs: foo, fiz or fiz, foo }