code: function copyArray$1(source, array) {
    var index = -1,
        length = source.length;
  
    array || (array = Array(length));
    while (++index < length) {
      array[index] = source[index];
    }
    return array;
  }
docs: Copies the values of `source` to `array`.
  
  @private
  @param {Array} source The array to copy values from.
  @param {Array} [array=[]] The array to copy values to.
  @returns {Array} Returns `array`.