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depromise

2.0.3 • Public • Published

Depromise

It hurts when callbacks executed inside promises throw errors. To avoid the hurt, use a Promise library such as bluebird that provides a .done method.

depromise provides a helper function success that takes a callback function of any arity and returns a function that will call the callback with the proper arguments.

Usage

var depromise = require('depromise');

The usual callback pattern

function fnWithCallback(data, next) {
 
  var onFailure = next;
  var onSuccess = depromise.success(next);
 
  promisedFunction(data)
    .then(function(result) {
 
      // do something with result
      return result
 
    })
    .done(onSuccess, onFailure)
 
}
 
fnWithCallback('foo', function(err, result) {
 
  // err === null
  // result === 'foo'
 
});

Callbacks with multiple arguments

Call depromise.success with the optional HAS_MULTIPLE_ARGS flag (true) and return an array containing the arguments for the callback.

 
function fnWithCallback(data, next) {
 
  var onFailure = next;
  var onSuccess = depromise.success(next, depromise.HAS_MULTIPLE_ARGS);
 
  promisedFunction(data)
    .then(function(result) {
 
      // do something with result
      return [result, 'bar'];
 
    })
    .done(onSuccess, onFailure)
 
}
 
fnWithCallback('foo', function(err, foo, bar) {
 
  // err === null
  // foo === 'foo'
  // bar === 'bar'
 
});

Readme

Keywords

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Install

npm i depromise

Repository

github.com/damonmcminn/depromise

Homepage

github.com/damonmcminn/depromise#readme

Weekly Downloads

0

Version

2.0.3

License

MIT

Last publish

Collaborators

  • damonmcminn
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