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snippets/js/s/drop-right-while.md

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+---
+title: Drop list elements from the right based on function
+type: snippet
+language: javascript
+tags: [array]
+cover: bridge-drop
+dateModified: 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]
+```