Run
A simple es6 generator based control flow, or simple generator runner
All credits go to: Kyle Simpson and Benjamin Gruenbaum
I just isolated this function, made small flavor changes and created a npm package.
Usage:
var run = require('run'); // import
run(function *() { // generator function
var value = yield asyncFunction();
var anotherValue = yield anotherAsyncFunction();
});So each yielded function will stop the code until it resolves making async calls run on a more readable way, avoiding the callback hell.
Important: All yielded functions must return a promise
Like this:
function asyncFunction() {
return new Promise((resolve, reject) => {
request('http://google.com', (err, response, body) => {
if (err) {
return reject();
}
resolve(body);
});
});
}Errors can be intercepted both with try catch, or with .catch promise method:
run(function *() { // generator function
try {
var value = yield asyncFunction();
} catch (e) {
/* catches any error threw with using reject */
}
});
/* OR */
run(function *() { // generator function
var value = yield asyncFunction();
}).catch(e => {
/* something */
});