zipWithIndex() function

既存の Iterable/AsyncIterable 値にインデックスを含む Iterable/AsyncIterable を返します。

Signature:

declare function zipWithIndex<
  T extends Iterable<unknown> | AsyncIterable<unknown>,
>(iterable: T): ReturnZipWithIndexType<T>;

Example

const iter = zipWithIndex(["a", "b", "c", "d"]);
iter.next(); // {done:false, value: [0, "a"]}
iter.next(); // {done:false, value: [1, "b"]}
iter.next(); // {done:false, value: [2, "c"]}
iter.next(); // {done:false, value: [3, "d"]}
iter.next(); // {done:true, value: undefined}

// with pipe
pipe(["a", "b", "c", "d"], zipWithIndex, toArray); // [[0, "a"], [1, "b"], [2, "c"], [3, "d"]]

await pipe(Promise.resolve(["a", "b", "c", "d"]), zipWithIndex, toArray); // [[0, "a"], [1, "b"], [2, "c"], [3, "d"]]

// with toAsync
await pipe(
  [
    Promise.resolve("a"),
    Promise.resolve("b"),
    Promise.resolve("c"),
    Promise.resolve("d"),
  ],
  toAsync,
  zipWithIndex,
  toArray,
); // [[0, "a"], [1, "b"], [2, "c"], [3, "d"]]

Try It

see pipe, toAsync, toArray

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