Promise Sample

patternA.coffee

Promise = require 'bluebird'

methodB = ->
  new Promise (resolve, reject)->
    setTimeout ->
      console.log 'methodB'
      reject 'hoge'
    , 1000

methodA = (param)->
  p = new Promise (resolve, reject)->
    unless param
      return reject 'methodA Reject'
    else
      return do resolve
  p
  .then ->
    methodB()

console.log 'start'

methodA('p')
.then (v)->
  console.log "this is then. #{v}"
.catch (e)->
  console.log "this is catch. #{e}"

console.log 'end'

###
start
end
methodB
this is catch. hoge
###

patternB.coffee

Promise = require 'bluebird'

methodB = ->
  new Promise (resolve, reject)->
    setTimeout ->
      console.log 'methodB'
      reject 'hoge'
    , 1000

methodA = (param)->
  new Promise (resolve, reject)->
    unless param
      return reject 'methodA Reject'
    else
      methodB()
      .then ->
        return do resolve
      .catch (e)->
        return reject 'methodA Catch'

console.log 'start'

methodA('p')
.then (v)->
  console.log "this is then. #{v}"
.catch (e)->
  console.log "this is catch. #{e}"

console.log 'end'

###
start
end
methodB
this is catch. methodA Catch
###

patternC.coffee

Promise = require 'bluebird'
 
methodB = ->
  new Promise (resolve, reject)->
    setTimeout ->
      console.log 'methodB'
      reject 'hoge'
    , 1000
 
methodA = (param)->
  new Promise (resolve, reject)->
    unless param
      return reject 'methodA Reject'
    else
      resolve methodB()
 
console.log 'start'
 
methodA('p')
.then (v)->
  console.log "this is then. #{v}"
.catch (e)->
  console.log "this is catch. #{e}"
 
console.log 'end'
 
###
start
end
methodB
this is catch. hoge
###