I want to call this:
function fwc(a, b, callback) {
dosomestuff(a,b);
callback();
}
with this:
fwc (a,b);
Sometimes i need the callback and sometimes I don't. Can this cause trouble when I call the function and completely ignore the callback?
If you can't change the fwc function, you can call it like this :
fwc(a, b, function(){});
This way there won't be an error when fwc tries to call the third argument.
If you can change it, change it to
function fwc(a, b, callback) {
dosomestuff(a,b);
if (callback) callback();
}
You should check the type of your callback like this:
function fwc(a, b, callback) {
dosomestuff(a,b);
if( typeof( callback ) == "function" ){
callback();
}
}
Use a ternary operator to do a simple check to see if the function exists.
function fwc(a, b, callback) {
dosomestuff(a,b);
(callback) ? callback():"";
}
Or like this:
function fwc(a, b, callback) {
dosomestuff(a,b);
callback && callback();
}
You can also check for callback type to make sure it's a function. If so check Travis's general answer.
