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co

generator async control flow goodness

  • 4.6.0
  • unpublished
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
24M
decreased by-14.52%
Maintainers
3
Weekly downloads
 
Created

What is co?

The co npm package is a generator based flow-control utility for Node.js and the browser, making it easier to work with asynchronous JavaScript operations. It allows you to use generators to yield any function that returns a Promise. It can be used to simplify callback or promise-based code, especially in the context of async/await patterns.

What are co's main functionalities?

Sequential Execution

This feature allows for sequential execution of asynchronous tasks. The code sample demonstrates how you can use co to run promises in sequence using a generator function, which yields a promise that resolves to true.

co(function* () {
  var result = yield Promise.resolve(true);
  return result;
}).then(function (value) {
  console.log(value);
}, function (err) {
  console.error(err.stack);
});

Error Handling

This feature demonstrates how co can be used for error handling in asynchronous operations. The code sample shows a generator function yielding a promise that gets rejected, and the error is caught and logged.

co(function* () {
  try {
    yield Promise.reject(new Error('Oops!'));
  } catch (err) {
    console.error(err.message);
  }
});

Parallel Execution

This feature showcases how co can handle parallel execution of promises. The code sample illustrates a generator function yielding an array of promises, which co runs in parallel, and then logs the array of results.

co(function* () {
  var res = yield [
    Promise.resolve(1),
    Promise.resolve(2),
  ];
  return res;
}).then(function (value) {
  console.log(value);
});

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Package last updated on 09 Jul 2015

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