build-es/reduce.js


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'use strict';

import eachOfSeries from './eachOfSeries';

export default function reduce(arr, memo, iterator, cb) {
    eachOfSeries(arr, function(x, i, cb) {
        iterator(memo, x, function(err, v) {
            memo = v;
            cb(err);
        });
    }, function(err) {
        cb(err, memo);
    });
}