concat() function

与えられた iterable を連結した結果を返します。

Signature:

declare function concat<
  A extends Iterable<unknown> | AsyncIterable<unknown>,
  B extends Iterable<unknown> | AsyncIterable<unknown>,
>(iterable1: A, iterable2: B): ReturnConcatType<A, B>;

Example

const iter = concat([1, 2], [3, 4]);
iter.next(); // {done:false, value: 1}
iter.next(); // {done:false, value: 2}
iter.next(); // {done:false, value: 3}
iter.next(); // {done:false, value: 4}
iter.next(); // {done:true, value: undefined}

// with pipe
pipe([3, 4], concat([1, 2]), toArray); // [1, 2, 3, 4]

await pipe(Promise.resolve([3, 4]), concat([1, 2]), toArray); // [1, 2, 3, 4]

await pipe(
  [Promise.resolve(3), Promise.resolve(4)],
  toAsync,
  concat([1, 2]),
  toArray,
); // [1, 2, 3, 4]

Try It

see pipe, toAsync, toArray

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