lekkerapps.lazy-promise

lazy-promise

Lazy promise evaluation. Only when 'then' is invoked or 'await' on promise that the promise logic is evaluated.

Motivation

LazyPromise provides promise with further 'deferred' behavior - only when a 'consumer' of the promise needs the 'asynchronous' data from it that the promise evaluation logic is invoked.

This behavior is useful and the library being a promise allows 'clean' code for the implementation of 'dependency' injection that is 'asynchronous' in nature (a 'provider' that loads data asynchronously).

Installation

  $ npm install lekkerapps-lazy-promise

The dist folder contains transpiled versions for the different flavors of module loaders (AMD/UMD/CommonJS/SystemJS) and javascript version (ES5/6)

Usage

var promise = new LazyPromise(function(resolve, reject) {
  ...
});

Evaluation

promise.then(function(value) {
  ...
})

promise.then((value) => {
  ...
})

const value = await promise;

License

Copyright © 2016 Ashley G Ramdass [e-mail]

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.