JS Built-ins
← Array77 / 226
ArrayArray.prototype.findLastbeginner

Array.prototype.findLast() — find last even number

📖 Usage Example
const nums = [5, 12, 8, 130, 44]
nums.findLast(n => n > 10)  // → 44  (last match)

Use findLast() to get the last element that satisfies a condition, searching from the end.

Array.prototype.findLast()

Array.prototype.findLast(callback) is the reverse of find() — it iterates from the end of the array and returns the last element for which the callback is truthy.

Challenge: Implement findLastEven(nums) that returns the last even number in the array.

findLastEven([1, 2, 3, 4, 5]) // → 4
findLastEven([1, 3, 5])       // → undefined
💡 Hints (2)
  • • `findLast()` scans from the end — the opposite direction from `find()`.
  • • Returns `undefined` (not `null`) when no match is found.