design patterns - Javascript - if with asynchronous case -

my question bit regards concept.

a lot of times there such situation:

if(something){     someasyncaction(); }else{     somesyncaction(); }  // continue rest of code.. var = 5; 

the problem such case clear, don't want var = 5 call unless someasyncaction() or somesyncaction() done, now, cause soasyncaction() asynchronous way (i can think of) solve situation that:

var after = function(){     // continue rest of code..     var = 5; }  if(something){     someasyncaction(after); }else{     somesyncaction();     after (); } 

but, code ugly, hard read , looks anti-pattern , problematic.

i trying think maybe can find solution promises (using bluebird @ backend) can't find something.

is faced before , can me figure out?

thanks!

with promises, have similar pattern callback, store result first , not have call/pass callback twice:

function after(result) {     // continue rest of code..     var = 5; } var promise; if (something){     promise = someasyncaction(); } else {     promise = promise.resolve(somesyncaction()); } promise.then(after); 

or in short, you'd use conditional operator , structure more straightforward:

(something   ? someasyncaction()   : promise.resolve(somesyncaction()) ).then(function(result) {     // continue rest of code..     var = 5; });