@panyam/tsutils/lib/esm/streams.js

Some basic TS utils for personal use

export function* streamArray(arr) {
    for (let i = 0; i < arr.length; i++) {
        yield [i, arr[i]];
    }
}
export function* streamDict(dict) {
    for (const key in dict) {
        yield [key, dict[key]];
    }
}
export function* mapStream(stream, mapper) {
    let i = 0;
    for (let next = stream.next(); !next.done; next = stream.next()) {
        yield mapper(next.value, i);
        i++;
    }
}
export function* filterStream(stream, filterFunc) {
    let i = 0;
    for (let next = stream.next(); !next.done; next = stream.next()) {
        if (filterFunc) {
            if (filterFunc(next.value, i)) {
                yield next.value;
            }
        }
        else if (next.value) {
            yield next.value;
        }
        i++;
    }
}
export function collectStream(stream, collector, collection) {
    let i = 0;
    for (let next = stream.next(); !next.done; next = stream.next()) {
        collection = collector(next.value, collection, i);
        i++;
    }
    return collection;
}
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