problems(js): add “2637. Promise Time Limit”

Signed-off-by: Matej Focko <me@mfocko.xyz>

problems/promise-time-limit.js

@@ -0,0 +1,19 @@
+/**
+ * @param {Function} fn
+ * @param {number} t
+ * @return {Function}
+ */
+var timeLimit = function(fn, t) {
+	return async function(...args) {
+        return new Promise((resolve, reject) => {
+            setTimeout(() => reject("Time Limit Exceeded"), t);
+
+            fn(...args).then(resolve).catch(reject);
+        });
+    }
+};
+
+/**
+ * const limited = timeLimit((t) => new Promise(res => setTimeout(res, t)), 100);
+ * limited(150).catch(console.log) // "Time Limit Exceeded" at t=100ms
+ */