Are return and return null the same thing?
Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies that data has been returned, while returning a null value clearly indicates that nothing has been returned.
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What to do instead of returning null?
Instead of returning null, the method should throw an exception with an explicit message such as “Could not find a connection string named ‘PatientDb'”. Not only does the software crash quickly, but the error message is easier to diagnose compared to the common null reference exception.
Why is using null bad?
NULL exacerbates bad language decisions. Java silently converts between reference types and primitive types. Add null, and things get even weirder. although it throws a NullPointerException when executed. It’s bad enough that member methods can be called on null; it’s even worse when you don’t even see the method being called.
Is it bad to return undefined?
A function returns undefined if no value was returned. Note: While you can use undefined as an identifier (variable name) in any scope other than the global (because undefined is not a reserved word), doing so is a very bad idea that will make your code difficult to maintain and debug.
Is it better to return NULL or empty values from functions?
Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies that data has been returned, while returning a null value clearly indicates that nothing has been returned.
When to return 0 instead of null in JavaScript?
Instead of returning null defaults (0 or empty string or empty object) they should be returned or an exception should be thrown. This is recommended to avoid many != null checks or to avoid NullPointerException. I really don’t understand how this helps.
When is null the best to return?
null is best to return if and only if the following conditions apply: null is expected in normal operation. null is used to mean “not found/no value”. The function is meant to return a single value, like findPerson().
When to throw an exception to return null?
This is why, to be clear to everyone, you should always throw an exception when you can’t return the value required by your return type. Throwing an exception is straightforward and comes with the ability to send a message to the developer. returning null or default will always be up for debate. Throwing an exception will close the whole discussion. Spot.