Topic Description

Create a dropRightWhile function that takes two parameters:

• array: The input array, which can hold any type of elements
• predicate: A predicate function that takes an element from the array and returns a Boolean value. If the predicate returns true, the element should be discarded.

The dropRightWhile function should iterate from the end of the array and remove elements that satisfy the specified condition until it encounters an element that does not meet the condition. It should then return a new array containing the remaining elements, ensuring that the original array remains unchanged.

console.log(dropRightWhile(['hello', 'world', 'today', 'isGood'], (value) => value.length > 5)); // => ['hello', 'world', 'today']

console.log(dropRightWhile([ { name: 'Alice', age: 25 }, { name: 'Charlie', age: 20 }, { name: 'Bob', age: 30 }, ], (obj) => obj.age > 25)) // => [{ name: 'Alice', age: 25 }, { name: 'Charlie', age: 20 }]

console.log(dropRightWhile([10, 20, 30, 40, 50, 10], (value) => value !== 10)) // => [10, 20, 30, 40, 50, 10]

console.log(dropRightWhile([1], (value) => value > 0)) // => []

Answer

function dropRightWhile(arr,predicate){
	let index = arr.length - 1
	for(let i = arr.length-1; i >= 0; i--){
		if( !predicate(arr[i]) ){
			break
		}else{
			index--
		}
	}
	return arr.slice(0,index+1)
}

function dropRightWhile(array, predicate) {
  let index = array.length-1

  while (index >=0 && predicate(array[index])) {
    index-- 
  }

  return array.slice(0,index+1)
}