7 Ways to Flatten Arrays in JavaScript

Array flattening is to convert multi-layer nested arrays to only one layer. To explain it in code, it would be [1, [2, [3, 4, 5]]] => [1, 2, 3, 4, 5]. Let’s see how it works! . . . 1. Array.prototype.flatMap + recursion Let’s first take a look at th...