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import isArrayLike from './isArrayLike.js'
import wrapAsync from './wrapAsync.js'
function filterArray(eachfn, arr, iteratee, callback) {
var truthValues = new Array(arr.length);
eachfn(arr, (x, index, iterCb) => {
iteratee(x, (err, v) => {
truthValues[index] = !!v;
iterCb(err);
});
}, err => {
if (err) return callback(err);
var results = [];
for (var i = 0; i < arr.length; i++) {
if (truthValues[i]) results.push(arr[i]);
}
callback(null, results);
});
}
function filterGeneric(eachfn, coll, iteratee, callback) {
var results = [];
eachfn(coll, (x, index, iterCb) => {
iteratee(x, (err, v) => {
if (err) return iterCb(err);
if (v) {
results.push({index, value: x});
}
iterCb(err);
});
}, err => {
if (err) return callback(err);
callback(null, results
.sort((a, b) => a.index - b.index)
.map(v => v.value));
});
}
export default function _filter(eachfn, coll, iteratee, callback) {
var filter = isArrayLike(coll) ? filterArray : filterGeneric;
return filter(eachfn, coll, wrapAsync(iteratee), callback);
}
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