last-result

Create an evented async interface that emits the last result from a series of calls

Install

$ npm install --save last-result

Usage

var Result = require('last-result')
var result = Result()
 
result.pending()
//=> false
 
result.error()
//=> null
 
Result.load(result, function (callback) {
  //=> result.pending() === true
  load(callback)
})
 
function load (callback) {
  //=> load data from server
  //=> call callback w/ err, data
}
 
Result.onData(result, console.log)
//=> data
 
Result.onError(result, console.log)
//=> null / Error

API

Result([data]) -> function

Returns an observable result state.

data

Type: object Default: {pending: false, error: null}

The initial result state.

Result.load(state, fn) -> undefined

state

Required
Type: function

A result state observable.

fn

Required
Type: function
Arguments: callback

A function to call to trigger load. The function will receive a callback that will update the result state and trigger events based on the result.

Result.onData(state, listener) -> function

Returns a function that removes the event listener.

state

Required
Type: function

A result state observable.

listener

Required
Type: function

A function to be called with the result data passed back from the function provided to Result.load.

Result.onError(state, listener) -> function

Returns a function that removes the event listener.

state

Required
Type: function

A result state observable.

listener

Required
Type: function

A function to be called with an error passed back from the function provided to Result.load.

License

MIT © Ben Drucker