timers: optimize timer functions with improved argument handling

lib/timers.js

@@ -22,7 +22,6 @@
 'use strict';
 
 const {
-  ArrayPrototypePush,
   MathTrunc,
   ObjectDefineProperties,
   ObjectDefineProperty,
@@ -113,38 +112,13 @@ function unenroll(item) {
  * after `after` milliseconds.
  * @param {Function} callback
  * @param {number} [after]
- * @param {any} [arg1]
- * @param {any} [arg2]
- * @param {any} [arg3]
+ * @param {...any} [args]
  * @returns {Timeout}
  */
-function setTimeout(callback, after, arg1, arg2, arg3) {
+function setTimeout(callback, after, ...args) {
   validateFunction(callback, 'callback');
-
-  let i, args;
-  switch (arguments.length) {
-    // fast cases
-    case 1:
-    case 2:
-      break;
-    case 3:
-      args = [arg1];
-      break;
-    case 4:
-      args = [arg1, arg2];
-      break;
-    default:
-      args = [arg1, arg2, arg3];
-      for (i = 5; i < arguments.length; i++) {
-        // Extend array dynamically, makes .apply run much faster in v6.0.0
-        ArrayPrototypePush(args, arguments[i]);
-      }
-      break;
-  }
-
-  const timeout = new Timeout(callback, after, args, false, true);
+  const timeout = new Timeout(callback, after, args.length ? args : undefined, false, true);
   insert(timeout, timeout._idleTimeout);
-
   return timeout;
 }
 
@@ -182,38 +156,13 @@ function clearTimeout(timer) {
  * every `repeat` milliseconds.
  * @param {Function} callback
  * @param {number} [repeat]
- * @param {any} [arg1]
- * @param {any} [arg2]
- * @param {any} [arg3]
+ * @param {...any} [args]
  * @returns {Timeout}
  */
-function setInterval(callback, repeat, arg1, arg2, arg3) {
+function setInterval(callback, repeat, ...args) {
   validateFunction(callback, 'callback');
-
-  let i, args;
-  switch (arguments.length) {
-    // fast cases
-    case 1:
-    case 2:
-      break;
-    case 3:
-      args = [arg1];
-      break;
-    case 4:
-      args = [arg1, arg2];
-      break;
-    default:
-      args = [arg1, arg2, arg3];
-      for (i = 5; i < arguments.length; i++) {
-        // Extend array dynamically, makes .apply run much faster in v6.0.0
-        ArrayPrototypePush(args, arguments[i]);
-      }
-      break;
-  }
-
-  const timeout = new Timeout(callback, repeat, args, true, true);
+  const timeout = new Timeout(callback, repeat, args.length ? args : undefined, true, true);
   insert(timeout, timeout._idleTimeout);
-
   return timeout;
 }
 
@@ -255,35 +204,12 @@ Timeout.prototype[SymbolToPrimitive] = function() {
  * Schedules the immediate execution of `callback`
  * after I/O events' callbacks.
  * @param {Function} callback
- * @param {any} [arg1]
- * @param {any} [arg2]
- * @param {any} [arg3]
+ * @param {...any} [args]
  * @returns {Immediate}
  */
-function setImmediate(callback, arg1, arg2, arg3) {
+function setImmediate(callback, ...args) {
   validateFunction(callback, 'callback');
-
-  let i, args;
-  switch (arguments.length) {
-    // fast cases
-    case 1:
-      break;
-    case 2:
-      args = [arg1];
-      break;
-    case 3:
-      args = [arg1, arg2];
-      break;
-    default:
-      args = [arg1, arg2, arg3];
-      for (i = 4; i < arguments.length; i++) {
-        // Extend array dynamically, makes .apply run much faster in v6.0.0
-        ArrayPrototypePush(args, arguments[i]);
-      }
-      break;
-  }
-
-  return new Immediate(callback, args);
+  return new Immediate(callback, args.length ? args : undefined);
 }
 
 ObjectDefineProperty(setImmediate, customPromisify, {