Top "Undefined" questions

Why is null an object and what's the difference between null and undefined?

Why is null considered an object in JavaScript? Is checking if ( object == null ) Do something the same as if ( !object ) …

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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 …

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JavaScript checking for null vs. undefined and difference between == and ===

How do I check a variable if it's null or undefined and what is the difference between the null and …

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JavaScript null check

I've come across the following code: function test(data) { if (data != null && data !== undefined) { // some code here } } I'm …

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C++ error 'Undefined reference to Class::Function()'

I was wondering if anyone could help me out with this - I'm only new to C++ and it's causing …

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What is the difference between null and undefined in JavaScript?

I want to know what the difference is between null and undefined in JavaScript.

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PHP Notice: Undefined offset: 1 with array when reading data

I am getting this PHP error: PHP Notice: Undefined offset: 1 Here is the PHP code that throws it: $file_handle = …

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undefined offset PHP error

I am receiving the following error in PHP Notice undefined offset 1: in C:\wamp\www\includes\imdbgrabber.php line 36 Here …

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Linker Error C++ "undefined reference "

Possible Duplicate: What is an undefined reference/unresolved external symbol error and how do I fix it? Trying to compile …

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Test if something is not undefined in JavaScript

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

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