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javascript/snippets/take-right-until.md

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+---
+title: Remove list elements from the end until condition is met
+type: snippet
+tags: [array]
+cover: fruit-feast
+dateModified: 2020-11-29T12:04:53+02:00
+---
+
+Removes elements from the end of an array until the passed function returns `true`.
+Returns the removed elements.
+
+- Create a reversed copy of the array, using the spread operator (`...`) and `Array.prototype.reverse()`.
+- Loop through the reversed copy, using a `for...of` loop over `Array.prototype.entries()` until the returned value from the function is truthy.
+- Return the removed elements, using `Array.prototype.slice()`.
+- The callback function, `fn`, accepts a single argument which is the value of the element.
+
+```js
+const takeRightUntil = (arr, fn) => {
+  for (const [i, val] of [...arr].reverse().entries())
+    if (fn(val)) return i === 0 ? [] : arr.slice(-i);
+  return arr;
+};
+```
+
+```js
+takeRightUntil([1, 2, 3, 4], n => n < 3); // [3, 4]
+```