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undefined

How to check ‘undefined’ value in jQuery

by IT Nursery

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

Tags javascript, jQuery, undefined

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

by IT Nursery

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

Tags c, c++-faq, undefined, undefined-behavior

“undefined” function declared in another file?

by IT Nursery

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

Tags func, go, undefined

Test if something is not undefined in JavaScript

by IT Nursery

I’m checking if(response[0].title !== undefined), but I get the error: Uncaught TypeError: Cannot read property ‘title’ of undefined. 11 Answers 11

Tags javascript, undefined

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

by IT Nursery

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 … Read more

Tags javascript, undefined

Set a variable if undefined in JavaScript

by IT Nursery

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

Tags javascript, undefined

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

by IT Nursery

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 … Read more

Tags javascript, undefined

Check if object exists in JavaScript

by IT Nursery

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

Tags debugging, javascript, null, undefined, variables

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

by IT Nursery

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

Tags javascript, jQuery, undefined

JavaScript check if variable exists (is defined/initialized)

by IT Nursery

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

Tags function, initialization, javascript, undefined, variables
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