AncyentMariner/flatten_arbitrary_array.js

## flatten_arbitrary_array.js
//Write some code, that will flatten an array of arbitrarily nested arrays of integers into a flat array of integers.
//e.g. [[1,2,[3]],4] -> [1,2,3,4].

const flatten_list = list => list.reduce(
    (a, b) => a.concat(Array.isArray(b) ? flatten_list(b) : b), []
);
	//Write some code, that will flatten an array of arbitrarily nested arrays of integers into a flat array of integers.
	//e.g. [[1,2,[3]],4] -> [1,2,3,4].

	const flatten_list = list => list.reduce(
	(a, b) => a.concat(Array.isArray(b) ? flatten_list(b) : b), []
	);