Chunking arrays and strings in typescript

chunk.ts

function chunk<T>(arr: T[], size: number): T[][] {
  const count = Math.ceil(arr.length / size)
  let out: T[][] = []
  for (let i = 0; i < count; i++) {
    out.push(arr.slice(count * i, count * (i + 1)))
  }
  return out
}

function chunkString(str: string, size: number): string[] {
  return chunk(str.split(''), size).map((part) => part.join(''))
}

chunkString('abcdefg', 4)

// iterable version
function* chunkIter(size: number, arr: T[]): IterableIterator<T[]> {
  for (let i = 0; i < arr.length; i += size) {
    yield arr.slice(i, i + size)
  }
}

// simpler alternative?
function chunk<T>(size: number, arr: T[]): T[][] {
  let chunks: T[][] = []
  for (let i = 0; i < arr.length; i += size) {
    chunks.push(arr.slice(i, i + size))
  }
  return chunks
}