undefined Archives - IT Nursery

javascript, Programming

IT Nursery

How to check ‘undefined’ value in jQuery

Possible Duplicate: Detecting an undefined object property in JavaScript javascript undefined compare How we can add a check for an undefined variable, like: ...

June 3, 2022
0 Comments

C++, Programming

IT Nursery

What are all the common undefined behaviours that a C++ programmer should know about? [closed]

It’s difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably ...

May 31, 2022
0 Comments

go, Programming

IT Nursery

“undefined” function declared in another file?

I’m trying to write a basic go program that calls a function on a different file, but a part of the same package. ...

May 30, 2022
0 Comments

javascript, Programming

IT Nursery

Test if something is not undefined in JavaScript

I’m checking if(response...

May 26, 2022
0 Comments

How to check if a JavaScript variable is NOT undefined? [duplicate]

This question already has answers here: JavaScript check if variable exists (is defined/initialized) (31 answers) Closed 6 years ago. Things I’ve tried that ...

May 24, 2022
0 Comments

Set a variable if undefined in JavaScript

I know that I can test for a JavaScript variable and then define it if it is undefined, but is there not some ...

May 24, 2022
0 Comments

Can I set variables to undefined or pass undefined as an argument?

I’m a bit confused about JavaScript’s undefined and null values. What does if (!testvar) actually do? Does it test for undefined and null ...

May 14, 2022
0 Comments

Check if object exists in JavaScript

How do I verify the existence of an object in JavaScript? The following works: if (!null) alert("GOT HERE"); But this throws an Error: ...

May 12, 2022
0 Comments

variable === undefined vs. typeof variable === “undefined”

The jQuery Core Style Guidelines suggest two different ways to check whether a variable is defined. Global Variables: typeof variable === "undefined" Local ...

May 12, 2022
0 Comments

JavaScript check if variable exists (is defined/initialized)

Which method of checking if a variable has been initialized is better/correct? (Assuming the variable could hold anything (string, int, object, function, etc.)) ...

May 5, 2022
0 Comments