hwangar · August 9, 2017 18:09
diff --git a/flatten.js b/flatten.js
 const a = [[1,2,[3]],4];

 const flatten = list => list.reduce(
    (all, elem) => all.concat(Array.isArray(elem) ? flatten(elem) : elem), []
 );

 console.log('------>', flatten(a));
	const a = [[1,2,[3]],4];

	const flatten = list => list.reduce(
	(all, elem) => all.concat(Array.isArray(elem) ? flatten(elem) : elem), []
	);

	console.log('------>', flatten(a));