Bump to v4.0.0.

head.js

@@ -0,0 +1,28 @@
+define([], function() {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Gets the first element of `array`.
+   *
+   * @static
+   * @memberOf _
+   * @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[0] : undefined;
+  }
+
+  return head;
+});