1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
var Q = require('q');
var _ = require('lodash');
// Reduce an array to a promise
function reduce(arr, iter, base) {
return _.reduce(arr, function(prev, elem, i) {
return prev.then(function(val) {
return iter(val, elem, i);
});
}, Q(base));
}
// Transform an array
function serie(arr, iter, base) {
return reduce(arr, function(before, item, i) {
return Q(iter(item, i))
.then(function(r) {
before.push(r);
return before;
});
}, []);
}
// Iter over an array and return first result (not null)
function some(arr, iter) {
return _.reduce(arr, function(prev, elem, i) {
return prev.then(function(val) {
if (val) return val;
return iter(elem, i);
});
}, Q());
}
module.exports = Q;
module.exports.reduce = reduce;
module.exports.serie = serie;
module.exports.some = some;
|
