Kebab file names

snippets/drop-right-while.md

@@ -0,0 +1,25 @@
+---
+title: Drop list elements from the right based on function
+tags: array
+cover: bridge-drop
+firstSeen: 2018-01-26T12:23:18+02:00
+lastUpdated: 2020-10-19T18:51:03+03:00
+---
+
+Removes elements from the end of an array until the passed function returns `true`.
+Returns the remaining elements in the array.
+
+- Loop through the array, using `Array.prototype.slice()` to drop the last element of the array until the value returned from `func` is `true`.
+- Return the remaining elements.
+
+```js
+const dropRightWhile = (arr, func) => {
+  let rightIndex = arr.length;
+  while (rightIndex-- && !func(arr[rightIndex]));
+  return arr.slice(0, rightIndex + 1);
+};
+```
+
+```js
+dropRightWhile([1, 2, 3, 4], n => n < 3); // [1, 2]
+```