@werker/html/iter.js

HTML templating and streaming response library for worker environments such as Cloudflare Workers

/**
 * Alternates items from the first and second iterable in the output iterable, until either input runs out of items.
 */
export function* interleave(xs, ys) {
    const itx = xs[Symbol.iterator]();
    const ity = ys[Symbol.iterator]();
    while (true) {
        const rx = itx.next();
        if (rx.done)
            break;
        else
            yield rx.value;
        const ry = ity.next();
        if (ry.done)
            break;
        else
            yield ry.value;
    }
}
/**
 * It's like interleave, but will flatten items of the second (async) iterable.
 */
export async function* aInterleaveFlattenSecond(xs, ys) {
    const itx = xs[Symbol.iterator]();
    const ity = ys[Symbol.iterator]();
    while (true) {
        const rx = itx.next();
        if (rx.done)
            break;
        else
            yield rx.value;
        const ry = ity.next();
        if (ry.done)
            break;
        else
            yield* ry.value;
    }
}
export function map(f) {
    return function* (iterable) {
        for (const x of iterable)
            yield f(x);
    };
}
export function aMap(f) {
    return async function* (iterable) {
        for await (const x of iterable)
            yield f(x);
    };
}
export function* join(iterable) {
    yield [...iterable].join('');
}
export async function* aJoin(iterable) {
    const chunks = [];
    for await (const x of iterable)
        chunks.push(x);
    yield chunks.join('');
}
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