Simplify deepClone snippet's handling of arrays.

test/deepClone/deepClone.js

@@ -1,16 +1,8 @@
 const deepClone = obj => {
-if (Array.isArray(obj)){
-let arr = [];
-obj.forEach(
-(i,v) => (arr[i] = typeof v === 'object' ? deepClone(v) : v)
-)
-return arr;
-}else {
 let clone = Object.assign({}, obj);
 Object.keys(clone).forEach(
 key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
 );
-return clone;
-}
+return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : obj;
 };
 module.exports = deepClone;