Function count

source code/utils/array.ts:7–11

(arr: readonly T[], pred: (x: T) => unknown)

}

export function count<T>(arr: readonly T[], pred: (x: T) => unknown): number {
  let n = 0
  for (const x of arr) n += +!!pred(x)
  return n
}

export function uniq<T>(xs: Iterable<T>): T[] {
  return [...new Set(xs)]