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

This solution has been working great for me, and i find it particularly easy to follow:

function flattenArray(arr) {
  // the new flattened array
  var newArr = [];

  // recursive function
  function flatten(arr, newArr) {
    // go through array
    for (var i = 0; i < arr.length; i++) {
      // if element i of the current array is a non-array value push it
      if (Array.isArray(arr[i]) === false) {
        newArr.push(arr[i]);
      }
      // else the element is an array, so unwrap it
      else {
        flatten(arr[i], newArr);
      }
    }
  }

  flatten(arr, newArr);

  return newArr;
}