raviteja83 · January 4, 2019 19:35
diff --git a/flatten b/flatten
 const arr = [[1,2,[3]],4];

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

 console.log(flatten(arr)); //[1, 2, 3, 4]
	const arr = [[1,2,[3]],4];

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

	console.log(flatten(arr)); //[1, 2, 3, 4]