null Archives - Page 5 of 6

How to check for an undefined or null variable in JavaScript?

We are frequently using the following code pattern in our JavaScript code if (typeof(some_variable) != 'undefined' && some_variable != null) { // Do ...

April 30, 2022
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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 undefined? What is ...

April 30, 2022
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Why is my Spring @Autowired field null?

Note: This is intended to be a canonical answer for a common problem. I have a Spring @Service class (MileageFeeCalculator) that has an ...

April 27, 2022
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How do I check for null values in JavaScript?

How can I check for null values in JavaScript? I wrote the code below but it didn’t work. if (pass == null || ...

April 22, 2022
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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 ( ...

April 18, 2022
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Which @NotNull Java annotation should I use?

I’m looking to make my code more readable as well as use tooling like IDE code inspection and/or static code analysis (FindBugs and ...

April 14, 2022
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Altering a column: null to not null

I have a table that has several nullable integer columns. This is undesirable for several reasons, so I am looking to update all ...

April 13, 2022
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Referring to the null object in Python

How do I refer to the null object in Python? 8 In Python, the ‘null’ object is the singleton None. To check if ...

April 13, 2022
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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. 3 36

April 13, 2022
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Is null check needed before calling instanceof?

Will null instanceof SomeClass return false or throw a NullPointerException? 8 No, a null check is not needed before using instanceof. The expression ...

April 12, 2022
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