javascript - Accessibility of outside variable within a promise in nodejs -

can explain me why don´t work:

var outsidevar = 15; myfunc.dosomething().then(function() {   console.log("outsidevar: " + outsidevar); }).fail(function(err) {   console.log("error: ", err); }); 

the output error: undefined or outsidevar: undefined (depends if outsidevar variable or property of object.

an outside variable should accessible inside function or i´m wrong?

edit: i´m using construction spookyjs , seems there issue objects containing long strings.

in nodejs, use function error. so:

mypromise.then(function() {   // callback, executed on successful promise resolution }, function() {   // errback, executed on rejection }, function() {   // progressback, executed if promise has progress report }); 

.fail() isn't recognizable function in node, unless have defined .fail() function explicitly. .fail() throwing undefined error. .fail() in nodejs used building unit tests, not promises. https://nodejs.org/api/assert.html

otherwise, written properly, closure should work. typical closure syntax. see is promise closure? more details promises closures.

edit use .catch() instead of explicit error function.