Convert JavaScript data structures

From object to array

const obj = {
  a: 1,
  b: 2,
  c: 3
};

// All of the below are now an array,
// you can use all the array methods and properties,
// e.g. .reduce or .length
const keys = Object.keys(obj); // ['a', 'b', 'c']
const values = Object.values(obj); // [1, 2, 3]
const entries = Object.entries(obj); // [["a", 1], ["b", 2], ["c", 3]]

Summary

• Object.keys(), Object.values(), Object.entries().
• The above are ES8 (ECMAScript 2017) new methods which are extremely helpful when converting from an Object into an Array.