Answers for "get array keys javascript"

get keys of dictionary js

// Get keys of a dictionary
let dict = { a:1 , b:2 , c:3 }

console.log( Object.keys(dict) ) // expected output : ['a', 'b', 'c']

get keys of object in an array

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]

.keys() array

var arr = ['a', , 'c'];
var sparseKeys = Object.keys(arr);
var denseKeys = [...arr.keys()];
console.log(sparseKeys); // ['0', '2']
console.log(denseKeys);  // [0, 1, 2]