What is a NullReferenceException, and how do I fix it?
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. … Read more
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. … Read more
How do I determine if variable is undefined or null? My code is as follows: var EmpName = $(“div#esd-names div#name”).attr(‘class’); if(EmpName == ‘undefined’){ … Read more
Is there a universal JavaScript function that checks that a variable has a value and ensures that it’s not undefined or null? I’ve … Read more
I saw this question, but I didn’t see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it … Read more
I use object != null a lot to avoid NullPointerException. What is an alternative to: if (someobject != null) { someobject.doCalc(); } 6 … Read more
Is null an instance of anything? No, there is no type which null is an instanceof. 15.20.2 Type Comparison Operator instanceof RelationalExpression: RelationalExpression instanceof ReferenceType At run … Read more
The language specification is where null is defined, and it says There is also a special null type, the type of the expression … Read more
How to check if my string is equal to null?
int is a primitive, null is not a value that it can take on. You could change the method return type to return java.lang.Integer and then … Read more
The easiest way to check is entity == null. There is no shorter way to do that. Note that there is a method for … Read more