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import filter from 'lodash/filter';
import noop from 'lodash/noop';
import once from './once';
export default function _filter(eachfn, arr, iteratee, callback) {
callback = once(callback || noop);
var truthValues = new Array(arr.length);
eachfn(arr, function (x, index, callback) {
iteratee(x, function (err, v) {
truthValues[index] = !!v;
callback(err);
});
}, function (err) {
if (err) return callback(err);
callback(null, filter(arr, function (_, index) {
return truthValues[index];
}));
});
}
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