diff --git a/protoMethods.js b/protoMethods.js
new file mode 100644
index 00000000..7e469d3f
--- /dev/null
+++ b/protoMethods.js
@@ -0,0 +1,25 @@
+/* eslint-disable no-console */
+
+'use strict';
+
+console.log('WeakMap');
+logProtoMethods(WeakMap);
+
+console.log('WeakSet');
+logProtoMethods(WeakSet);
+
+function logProtoMethods(ctor) {
+	const proto = ctor.prototype;
+	const keys = Object.getOwnPropertyNames(proto)
+		.filter(key => key !== 'constructor')
+		.concat(Object.getOwnPropertySymbols(proto));
+	console.log('keys:', keys);
+	for (const key of keys) {
+		console.log('----------');
+		console.log(`${typeof key === 'symbol' ? `Symbol(${key.description})` : key}:`);
+		const method = proto[key];
+		console.log(typeof method === 'function' ? method.toString() : JSON.stringify(method));
+		console.log(Object.getOwnPropertyDescriptor(proto, key));
+		if (typeof method === 'function') console.log(Object.getOwnPropertyDescriptors(method));
+	}
+}