day 10 task complete

Author: Sanchitbajaj02

day10/leetcode2666.js

@@ -0,0 +1,29 @@
+// 2666. Allow One Function Call
+// URL -> https://leetcode.com/problems/allow-one-function-call/
+
+/**
+ * @param {Function} fn
+ * @return {Function}
+ */
+var once = function (fn) {
+  let call = false;
+  return function (...args) {
+    if (!call) {
+      call = true;
+      return fn(...args);
+    }
+    return undefined;
+  }
+};
+
+/**
+* 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
+*/
+
+
+// Try this at your own risk
+var onceAlternative = fn => (...args) => fn ? [fn(...args), fn = undefined][0] : fn;