@reactivex/ix-esnext-esm/iterable/reduce.js

The Interactive Extensions for JavaScript

export function reduce(source, accumulator, ...seed) {
    const hasSeed = seed.length === 1;
    let i = 0;
    let hasValue = false;
    let acc = seed[0];
    for (const item of source) {
        if (hasValue || (hasValue = hasSeed)) {
            acc = accumulator(acc, item, i++);
        }
        else {
            acc = item;
            hasValue = true;
            i++;
        }
    }
    if (!(hasSeed || hasValue)) {
        throw new Error('Sequence contains no elements');
    }
    return acc;
}

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