lib/internal/concat.js


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export default function concat(eachfn, arr, fn, callback) {
    var result = [];
    eachfn(arr, function (x, index, cb) {
        fn(x, function (err, y) {
            result = result.concat(y || []);
            cb(err);
        });
    }, function (err) {
        callback(err, result);
    });
}