@effect-ts/system/_src/Stream/_internal/utils.ts

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

// ets_tracing: off

import * as A from "../../Collections/Immutable/Chunk/index.js"
import * as E from "../../Either/index.js"

export function zipChunks_<A, B, C>(
  fa: A.Chunk<A>,
  fb: A.Chunk<B>,
  f: (a: A, b: B) => C
): [A.Chunk<C>, E.Either<A.Chunk<A>, A.Chunk<B>>] {
  let fc = A.empty<C>()
  const len = Math.min(A.size(fa), A.size(fb))
  for (let i = 0; i < len; i++) {
    fc = A.append_(fc, f(A.unsafeGet_(fa, i), A.unsafeGet_(fb, i)))
  }

  if (A.size(fa) > A.size(fb)) {
    return [fc, E.left(A.drop_(fa, A.size(fb)))]
  }

  return [fc, E.right(A.drop_(fb, A.size(fa)))]
}