Array flat() and flatMap()The flat() and flatMap() methods for arrays creates a new array such that each nested array item is concatenated into it.arraysArrayswidely2020-01-152022-07-15https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.flathttps://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.flatmaparray-flathttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/flatjavascript.builtins.Array.flatjavascript.builtins.Array.flatMaphttps://nowyoucanuse.com/features--array-flat.html