Bump to v4.0.0.

internal/assocHas.js

@@ -0,0 +1,16 @@
+define(['./assocIndexOf'], function(assocIndexOf) {
+
+  /**
+   * Checks if an associative array value for `key` exists.
+   *
+   * @private
+   * @param {Array} array The array to query.
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  function assocHas(array, key) {
+    return assocIndexOf(array, key) > -1;
+  }
+
+  return assocHas;
+});