…e provided testing function. Let’s take a look at these new ES6 functions and their E…e provided testing function. Let’s take a look at these new ES6 functions and their ES5 equivalents(there is no ES5 equivalent for findIndex()).Javascript ES6 — Exploring the New Built-In Methods4.8K19Ben GarrisonDiogo ResendeFollowAug 24, 2017 · 1 min readindexOf() no?