Is Node.js Array.map() asynchronous?

Question

Can I count on nodeIDs mapping is completed every time doSomething() is called?

nodeIDs = $.map(nodeIDs, function(n){
    return n.match(/\\d+$/);
});
doSome         


        

Answer 1

This function is synchronous - otherwise it couldn't return the result of the map operation.

Any callbacks that might take longer time (mainly due to IO) are asynchronous in nodejs - unless the method is explicitely marked as being synchronous (such as fs.readFileSync - but that doesn't use a callback). You probably confused that somehow.