promise-steps v0.5.0

flowc

flowc is a tool to controll flows of promises/functions.

usage

1. promise flowing

var bb = require('bluebird'); // bluebird is not neccessary, only for testing
var fc = require('flows');
function a() {
  return bb.resolve(1);
}

function b() {
  return bb.resolve(2);
}

fc(a, b).then(function(v) {
  console.log(v); //print 2
}).catch(function(err) {
});

2. passing value

var bb = require('bluebird'); // bluebird is not neccessary, only for testing
var fc = require('flows');
function a() {
  return bb.resolve(1);
}

function b(v) {
  return bb.resolve(2 + v);
}

fc(a, b).then(function(v) {
  console.log(v); //print 3
}).catch(function(err) {
});

3. handle error

var bb = require('bluebird'); // bluebird is not neccessary, only for testing
var fc = require('flows');
function a() {
  return bb.resolve(1);
}

function b(v) {
  return bb.reject(new Error('test));
}

fc(a, b).then(function(v) {
  console.log(v); //can't come here
}).catch(function(err) {
  console.log(err.message); //test
});

4. mix promise and sync function

var bb = require('bluebird'); // bluebird is not neccessary, only for testing
var fc = require('flows');
function a() {
  return bb.resolve(1);
}

function b(v) {
  return bb.resolve(v + 3);
}

function c(v) {
  return v + 100;
}

fc(a, b).then(function(v) {
  console.log(v); // 104
}).catch(function(err) {
});