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'use strict';
import arrayMap from 'lodash/_arrayMap';
import property from 'lodash/_baseProperty';
import map from './map';
export default function sortBy (arr, iterator, cb) {
map(arr, function (x, cb) {
iterator(x, function (err, criteria) {
if (err) return cb(err);
cb(null, {value: x, criteria: criteria});
});
}, function (err, results) {
if (err) return cb(err);
cb(null, arrayMap(results.sort(comparator), property('value')));
});
function comparator(left, right) {
var a = left.criteria, b = right.criteria;
return a < b ? -1 : a > b ? 1 : 0;
}
}
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