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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Disclaimer: Some of the functions in this module implement APIs from
+// Jeremy Ashkenas's http://underscorejs.org/ library and all credits for
+// those goes to him.
+
+"use strict";
+
+module.metadata = {
+ "stability": "unstable"
+}
+
+const arity = f => f.arity || f.length;
+exports.arity = arity;
+
+const name = f => f.displayName || f.name;
+exports.name = name;
+
+const derive = (f, source) => {
+ f.displayName = name(source);
+ f.arity = arity(source);
+ return f;
+};
+exports.derive = derive;
+
+const invoke = (callee, params, self) => callee.apply(self, params);
+exports.invoke = invoke;