js Array flat

The `flat()` method is used to flatten nested arrays. It takes an optional argument, `depth`, which specifies how many levels of nesting to flatten. If no argument is provided, it defaults to 1.

Syntax:

array.flat([depth])

Example:

const arr = [1, 2, [3, 4], [5, [6, 7]]];
const flattenedArr = arr.flat(); // [1, 2, 3, 4, 5, [6, 7]]
const deeplyFlattenedArr = arr.flat(2); // [1, 2, 3, 4, 5, 6, 7]