Promise tryall

A Promise function that will try to resolve all of the Promises passed to it, if any succeed, the promise will get resolved and will not error, if they ALL fail then the promise is rejected.

This is useful for trying to do many concurrent operations at the same time and collecting the results afterwards in a higher level abstraction. See the example.

Bring your own Promises

This module expects Promise to be defined on the global scope. Use something like es6-promise to polyfill if it doesn not exist.

Example

var tryall = require('tryall');

tryall([
	fetch("http://servicea.com"),
	fetch("http://serviceb.com"),
	fetch("http://servicec.com")
]).then(function(result) {
	if (result[0] !== undefined) {
		// Update some stuff relating to servicea.com
	}

	if (result[1] !== undefined) {
		// Update some stuff relating to serviceb.com
	}

	if (result[2] !== undefined) {
		// Update some stuff relating to servicec.com
	}

	return result;
}).catch(error) {
	// They ALL failed :(
	console.log("servicea.com failed because", error[0]);
	console.log("serviceb.com failed because", error[1]);
	console.log("servicec.com failed because", error[2]);
})

License

MIT, (c) Samuel Giles 2015