lantosgyuri/easyTwoDimensionalArrayFlatten.js

## easyTwoDimensionalArrayFlatten.js
const arr = [1,2,3];
const arr2 = [4,5,6,[7], [8]];
console.log(arr.concat(arr2)); // not flattened
console.log([...arr, ...arr2]); // not flattened
console.log(arr.concat(...arr2)); // flattened
	const arr = [1,2,3];
	const arr2 = [4,5,6,[7], [8]];
	console.log(arr.concat(arr2)); // not flattened
	console.log([...arr, ...arr2]); // not flattened
	console.log(arr.concat(...arr2)); // flattened