edrdesigner · November 23, 2019 21:36
diff --git a/flattenArrays.js b/flattenArrays.js
 export default function flatten(arr) {
  return arr.reduce((flat, toFlatten) => {
    return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
  }, []);
 }

 // Test
 flatten([[1,2,[3]],4]);
	export default function flatten(arr) {
	return arr.reduce((flat, toFlatten) => {
	return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
	}, []);
	}

	// Test
	flatten([[1,2,[3]],4]);