Bump to v4.0.0.

internal/assocGet.js

@@ -0,0 +1,16 @@
+import assocIndexOf from './assocIndexOf';
+
+/**
+ * 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];
+}
+
+export default assocGet;