Dividing an array by filter function

Question

I have a Javascript array that I would like to split into two based on whether a function called on each element returns true or false. Essentially

Answer 1

I ended up doing this because it's easy to understand (and fully typed with typescript).

const partition = (array: T[], isValid: (element: T) => boolean): [T[], T[]] => {
  const pass: T[] = []
  const fail: T[] = []
  array.forEach(element => {
    if (isValid(element)) {
      pass.push(element)
    } else {
      fail.push(element)
    }
  })
  return [pass, fail]
}

// usage
const [pass, fail] = partition([1, 2, 3, 4, 5], (element: number) => element > 3)