head.js

define([], function() {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /**
   * Gets the first element of `array`.
   *
   * @static
   * @memberOf _
   * @since 0.1.0
   * @alias first
   * @category Array
   * @param {Array} array The array to query.
   * @returns {*} Returns the first element of `array`.
   * @example
   *
   * _.head([1, 2, 3]);
   * // => 1
   *
   * _.head([]);
   * // => undefined
   */
  function head(array) {
    return (array && array.length) ? array[0] : undefined;
  }

  return head;
});