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module.exports = function (arr, iterator, callback) {
callback = callback || function () {};
if (!Array.isArray(arr) || !arr.length) {
return callback();
}
var completed = 0;
var iterate = function () {
iterator(arr[completed], function (err) {
if (err) {
callback(err);
callback = function () {};
}
else {
++completed;
if (completed >= arr.length) { callback(); }
else { nextTick(iterate); }
}
});
};
iterate();
};
function nextTick (cb) {
if (typeof setImmediate === 'function') {
setImmediate(cb);
} else {
process.nextTick(cb);
}
}