Is there an easy way to make nested array flat?

Question

That is to make this:

[ [\'dog\',\'cat\', [\'chicken\', \'bear\'] ],[\'mouse\',\'horse\'] ]

into:

[\'dog\',\'cat\',\'chicken\',\'

Answer 1

That's why I love javascript:

function flattenArray(source) {
  return source.toString().split(',');
}

flattenArray([['dog', 'cat', ['chicken', 'bear']], ['mouse', 'horse']]);
// -> ['dog','cat','chicken','bear','mouse','horse']