array-promise-filter
Filter an array through async callback.
The results can be accessed from the returned promise.
res = filter(values, fn)
var filter = require('array-promise-filter');
values
Type: Array
The array to be filtered.
fn
Type: function
fn
should do one of the following.
Respect synchronous signature
fn(val, index, arr)
var filter = require('..');
function isUpperCase(n) {
return !n.split().some(function (c) {
return c >= 'a';
});
}
filter(['ab', 'CD', 'ef', 'GH'], isUpperCase)
.then(function (res) {
console.log(res);
})
.catch(function (err) {
console.log(err);
});
Respect asynchronous signature
fn(val, index, arr, next)
next(err, keep)
must be called when fn
finishes.
var filter = require('..');
function isUpperCase(n, i, arr, next) {
process.nextTick(function () {
try {
next(null, !n.split().some(function (c) {
return c >= 'a';
}));
} catch (e) {
next(e);
}
});
}
filter(['ab', 'CD', 'ef', 'GH'], isUpperCase)
.then(function (res) {
console.log(res);
})
.catch(function (err) {
console.log(err);
});
Return a promise
var filter = require('..');
function isUpperCase(n) {
return new Promise(function (rs, rj) {
process.nextTick(function () {
try {
rs(!n.split().some(function (c) {
return c >= 'a';
}));
} catch (e) {
rj(e);
}
});
});
}
filter(['ab', 'CD', 'ef', 'GH'], isUpperCase)
.then(function (res) {
console.log(res);
})
.catch(function (err) {
console.log(err);
});
res
Type: Promise