Promise forking and error handling

JavaScript

function handleUnexpectedError(reason) {
    console.error(reason)
}
function handleUnexpectedErrorFactory(prefix) {
    return function(reason) {
        console.error('[' + prefix + '] ' + reason)
    }
}

var get42 = function() {
  return new Promise(function(resolve, reject) {
  	console.log('tt1');
    if (false) {
    //if (true) {
      resolve(42);
    } else {
      //reject('not lucky today');
      throw 'not lucky today';
    }
  });
};

function getNumber () {
		console.log('tt0');
    var promise = get42();
		console.log('tt2');
    
    // we do a fork here, because we return `promise`, not the chain of promise.then.then.then


    // promise.then(function(value) { 
    //   console.log('fork 1, the value is: ' + value); 
    // }).then(function(){
    //   console.log("B")
    // }).then(function(){
    //   console.log("C")
    // //});
    // //}).catch(handleUnexpectedError);
    // }).catch(handleUnexpectedErrorFactory('fork 1'));
    
    return promise;
}

getNumber();

// getNumber().then(function(value) {
//       console.log('fork 2, the value is: ' + value); 
// //});
// //}).catch(handleUnexpectedError)
// }).catch(handleUnexpectedErrorFactory('fork 2'))

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Promise forking and error handling

JavaScript

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Join the 4+ million users, and keep the JSFiddle dream alive.

Ad-free

Use pre-released features

Fiddle collections

Private collections and fiddles

Console