iteragain/dist/esm/reduce.js

Javascript Iterable/Iterator/Generator-function utilities.

import { REDUCE_EMPTY_ERROR } from './internal/emptyIteratorError';
import toIterator from './toIterator';
export function reduce(...args) {
    if (typeof args[0] === 'function')
        return it => reduce(it, args[0], args[1]);
    const it = toIterator(args[0]);
    let next;
    const reducer = args[1];
    if (args[2] === undefined) {
        const first = it.next();
        if (first.done)
            throw new TypeError(REDUCE_EMPTY_ERROR);
        let accumulator = first.value;
        while (!(next = it.next()).done)
            accumulator = reducer(accumulator, next.value);
        return accumulator;
    }
    let accumulator = args[2];
    while (!(next = it.next()).done)
        accumulator = reducer(accumulator, next.value);
    return accumulator;
}
export default reduce;
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