Code examples

50bluebird_newPromise.js

/**
 * basic usage of bluebird
 */

var Promise = require("bluebird");

//defining an async function
var clAsync = function () {
  var P = new Promise(function (resolve, reject) {
    console.log('Write from function');
    resolve('ok');
    reject('not ok');
  });

/*
  {
  "isFulfilled": true,
  "isRejected": false,
  "fulfillmentValue": "ok"
  }
   */
  console.log(JSON.stringify(P, null, 2));

return P;
};

console.log(JSON.stringify(clAsync, null, 2)); //undefined

//executing promisified function clAsync() and adding new callback with then method
clAsync()

.then(function (returnedVal) {
    console.log('THEN 1 - fulfillmentValue= ' + returnedVal);
    return {one: 1, two: 'drugi'}; //returning to next then
  })

.then(function (returnedVal) {
    console.logs('THEN 2 - fulfillmentValue= ' + returnedVal.one + returnedVal.two);
    // return new Error('Namjerna greška');  --doesn't work
    throw new Error('Namjerna greška', 'someFile.js', 152);
  })

//catch type errors
  .catch(TypeError, function (e) {
    console.error(e.stack);
    // console.error(e.message);
  })

//catch all other errors
  .catch(function (e) {
    console.error(e.message);
    // console.error(e.stack);
  });

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