Add debounce

snippets/debounce.md

@@ -0,0 +1,29 @@
+### debounce
+
+Creates a debounced function that delays invoking the provided function until after `wait` milliseconds have elapsed since the last time the debounced function was invoked.
+
+Use `setTimeout()` and `clearTimeout()` to debounce the given method, `fn`.
+Use `Function.apply()` to apply the `this` context to the function and provide the necessary `arguments`.
+Omit the second argument, `wait`, to set the timeout at a default of 0 ms.
+
+```js
+const debounce = (fn, wait = 0) => {
+  let inDebounce;
+  return function() {
+    const context = this,
+      args = arguments;
+    clearTimeout(inDebounce);
+    inDebounce = setTimeout(() => fn.apply(context, args), wait);
+  };
+};
+```
+
+```js
+window.addEventListener(
+  'resize',
+  debounce(function(evt) {
+    console.log(window.innerWidth);
+    console.log(window.innerHeight);
+  }, 250)
+); // Will log the window dimensions at most every 250ms
+```