vo

Vo is a control flow library for minimalists.

What you get

• new in 4.0 Consistent function signatures
• Tiny library (4kb minified + gzipped)
• Supports promises, generators, & sync functions
• Serial and parallel execution for every flow
• 2 different kinds of flows: pipeline & stack
• Easily catch and fix errors anywhere in the pipeline
• Errors passed as arguments so you know where the failure occurred
• Returns a promise that you can yield on or "await"
• Browser & server support
• Well-tested

Installation

• Node.js or Browserify: npm install vo
• Standalone: vo.js & vo.min

Getting Started

Vo supports 2 kinds of asynchronous flows:

• pipelines: Transformation pipeline. Return values become the arguments to the next function
• stacks: Express-style. Arguments are passed in at the top and flow through each middleware function

Both of these flows support both parallel and serial execution

Example

function * get (url) {
  return yield fetch(url)
}

function map (responses) {
  return responses.map(res => res.status)
}

vo([
  fetch('https://standupjack.com'),
  fetch('https://google.com')
], map).then(function (statuses) {
  assert.deepEqual([ 200, 200 ])
})

Guide

Coming soon! Check out the comprehensive test suite for now.

Vo Runtime

Now you can run generators top-level with the runtime:

index.js

var res = yield superagent.get('http://google.com')
console.log(res.status) // 200

vo index.js

FAQ

Binding a generator function isn't implemented consistently yet

Use co-bind just to be safe.

Test

We have a comprehensive test suite. Here's how you run it:

npm install
make test

License

MIT