0.1.2 • Published 8 years ago
flyd-eithers v0.1.2
Flyd-Eithers
A utility library for working with Eithers in flyd streams.
This allows for error bubbling and safe transformations within flyd streams. Examples below.
API
Dependencies
You need to provide your own Either constructor/lib/implementation. This lib was tested with Eithers from both Sanctuary and Data.Either.
Example Usage
var S = require('Sanctuary');
var flydEithers = require('flyd-eithers')(S);
var flyd = require('flyd');
var a = flyd.stream();
var c = flydEithers
.toEither(a)
.map(function(x) { return x + 1; })
.scan(function(acc, x) { return acc + x; }, S.Right(10));
flyd.on(function(x) {
console.log(x);
}, c);
var count = 0;
setInterval(function() {
count++;
a(count);
}, 1000);
// Right(12);
// Right(15);
// etc..
Error Example
var S = require('Sanctuary');
var flydEithers = require('flyd-eithers')(S);
var flyd = require('flyd');
var a = flyd.stream();
var c = flydEithers
.toEither(a)
.map(function(x) { return x + 1; })
.scan(function(acc, x) { return acc + x; }, S.Right(10));
flyd.on(function(x) {
console.log(x);
}, c);
function mockHttpRequest() {
setTimeout(function() {
a(S.Left('error 404'));
}, 100);
}
mockHttpRequest();
// Left('error 404') // Safe travel through map and scan :)