Actual production code:

function isEmpty(val) {
return typeof val === 'undefined'
|| val === undefined
|| !(val !== undefined);
}

I'm starting to think the "infinite monkeys" metaphor is not a metaphor...

String nullabity check duel...
null, isEmpty(), "", " ", '', ' ', " null", boolean, NaN, undefined, isNullOrEmpty and finally try-catch

main(), toString(), isEmpty(), .printStackTrace() maybe not favorites but most used for sure

Few years ago I was looking at legacy code that was developed by offshore team (what could go wrong,right) and I see small utility method that looks like this:

public boolean isEmptyNotEmpty(String s) {
boolean empty=false;
If(s==null) {
empty =true;
}
If(s.equals("")) {
empty = true;
}
return empty;
}

Thinking in myself: was he/she paid per line the line of code??!?!

Up to this date that was the worst part of the code that I encountered....