add throttle utility in typescript

Author: therbta

TypeScript/throttle.ts

@@ -0,0 +1,26 @@
+// basic throttle - limits how often a function can fire
+// useful for scroll handlers, resize events etc
+
+function throttle<T extends (...args: any[]) => void>(
+  fn: T, 
+  limit: number
+): (...args: Parameters<T>) => void {
+  let lastCall = 0;
+  
+  return function(...args: Parameters<T>) {
+    const now = Date.now();
+    if (now - lastCall >= limit) {
+      lastCall = now;
+      fn(...args);
+    }
+  };
+}
+
+// example - only fires once per 200ms max
+const onScroll = throttle(() => {
+  console.log('scroll event');
+}, 200);
+
+window.addEventListener('scroll', onScroll);
+
+export { throttle };