Flatten Array

flatten.js

function flatten(array) {
  return flat(array, []);
}

function flat(array, result) {
  for (var i = 0; i < array.length; i++) {
    var current = array[i];
    if (Array.isArray(current)) {
      flat(current, result);
    } else {
      result.push(current);
    }
  }
  return result;
}

/*console.log('Testing arrays\n');
var array = [1,2,3,4];
console.log('array ' + JSON.stringify(array));
console.log('flattened to ' + JSON.stringify(flatten(array)) );
console.log('---------------');
var array2 = [1,[2,3,[4]]];
console.log('array ' + JSON.stringify(array2) );
console.log('flattened to ' + JSON.stringify(flatten(array2)) );*/