Drop Right While

easycodingJavaScriptArraysFunctions~10 min

Asked at Google, Meta, Amazon

Overview

Implement dropRightWhile(array, predicate) that removes elements from the end while predicate is true.

Examples

dropRightWhile([1,2,3,4], x => x > 2); // [1,2]

Solution

Reveal solution

function dropRightWhile(array, predicate) {
  let i = array.length - 1;
  while (i >= 0 && predicate(array[i], i, array)) i--;
  return array.slice(0, i + 1);
}

drop-right-while.js

Drop Right While

easycodingJavaScriptArrays

Overview

Implement dropRightWhile(array, predicate) that removes elements from the end while predicate is true.

Examples

dropRightWhile([1,2,3,4], x => x > 2); // [1,2]

Solution

Reveal solution

function dropRightWhile(array, predicate) {
  let i = array.length - 1;
  while (i >= 0 && predicate(array[i], i, array)) i--;
  return array.slice(0, i + 1);
}

NameTopicDifficulty

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