problems(js): add “2666. Allow One Function Call”

Signed-off-by: Matej Focko <mfocko@redhat.com>

problems/allow-one-function-call.js

@@ -0,0 +1,23 @@
+/**
+ * @param {Function} fn
+ * @return {Function}
+ */
+var once = function(fn) {
+    let called = false;
+    return function(...args){
+        if (called) {
+            return undefined;
+        }
+
+        called = true;
+        return fn(...args);
+    }
+};
+
+/**
+ * let fn = (a,b,c) => (a + b + c)
+ * let onceFn = once(fn)
+ *
+ * onceFn(1,2,3); // 6
+ * onceFn(2,3,6); // returns undefined without calling fn
+ */