Bump to v4.0.0.

internal/assocGet.js

@@ -0,0 +1,20 @@
+define(['./assocIndexOf'], function(assocIndexOf) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Gets the associative array value for `key`.
+   *
+   * @private
+   * @param {Array} array The array to query.
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  function assocGet(array, key) {
+    var index = assocIndexOf(array, key);
+    return index < 0 ? undefined : array[index][1];
+  }
+
+  return assocGet;
+});