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callpack
Advanced tools
Readme
Simply wraps a callback to "pack" multiple values into a single object.
Callpack packs values into an array-like object by default.
callpack(function(err, result) {
console.log(result[0] === 1); // true
console.log(result[1] === 2); // true
console.log(result.length); // 2
console.log(Array.isArray(result)); // false
console.log(Array.from(result)); // [1, 2]
console.log(result.toString()); // "[object Pack]"
})(null, 1, 2);
Callpack packs values into a simple object when you provide names.
callpack(function(err, result) {
console.log(result.first); // "Bill"
console.log(result.second); // "Thornton"
}, 'first', 'second')(null, 'Bill', 'Thornton');
Realistic example use case.
var async = require('async');
var callpack = require('callpack');
var fs = require('fs');
var request = require('request');
async.auto({
'page': cb => request('http://www.google.com', callpack(cb, 'response', 'body')),
'save': ['page', (result, cb) => {
if (result.page.response.statusCode == 200) {
fs.writeFile('./index.html', result.page.body, cb);
} else {
cb(result.page.response.statusMessage);
}
}]
});
Promisifying a callback library.
var callpack = require('callpack');
var promisify = require('es6-promisify');
var _request = require('request');
var request = promisify(function() {
var cbIndex = arguments.length - 1;
arguments[cbIndex] = callpack(arguments[cbIndex], 'response', 'body');
_request.apply(_request, arguments);
});
request('http://www.google.com').then(result => console.log(result.body), console.error);
Consuming an asynchronous function allows for flexibility, but often tools like the awesome async library are easier to use with only a single value. How the function is consumed should be up to the developer, not the library.
Thus callpack doesn't make any assumptions like "multiple values means an array". Instead the decision is still up the end developer. You may use the result from callpack as array, convert into an array, or use it to get an object that closely mimics spreading the arguments over a function.
FAQs
Pack multi-value callback results into a single argument.
The npm package callpack receives a total of 14 weekly downloads. As such, callpack popularity was classified as not popular.
We found that callpack demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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