Is using NULL bad?

Is using NULL bad?

NULL is a terrible design flaw, one that continues to cause constant, immeasurable pain. Only a few languages have managed to avoid its terror. If you do choose a language with NULL, at least possess the wisdom to avoid such awfulness in your own code and use the equivalent Maybe/Option.

What is NULL purpose?

Null is a sentinel value. It's a value that cannot possibly be real data and instead provides meta-data about the variable in use. Null assigned to a pointer indicates that the pointer is uninitialized.

Is NULL of empty?

A variable is NULL if it has no value, and points to nowhere in memory. empty() is more a literal meaning of empty, e.g. the string "" is empty, but is not NULL .

Is NULL a valid value?

A JSON text is a sequence of tokens representing structured data transmitted as a string. A JSON value is be an object, array, number, or string, or one of the three literal names: false, null or true. In RFC 4627, a JSON text was defined as serialized object or array. ... But even in RFC 4627, null was a valid JSON value.

Why return null is bad?

This is a violation of DRY principle. Getting a null value is an ambiguous for caller, because it doesn't say whether the null is returned due to the bug or due to the fact that the order was not found in the database. Returning null is definitely not a domain-driven design approach.

Why NULL is a billion dollar mistake?

Speaking at a software conference in 2009, Tony Hoare apologized for inventing the null reference: I call it my billion-dollar mistake. It was the invention of the null reference in 1965. ... But I couldn't resist the temptation to put in a null reference, simply because it was so easy to implement.

What is null null message?

Null usually means "no signal" but don't know in your case as you do not say if you are only getting the notification...and still getting the message?...or not getting the message?...or if it is happening to just one contact?...

What does != NULL mean?

in above statement what is the meaning of variable != null ? It's a condtion which checks for the 'variable' not equal to the value 'null'. != means not equal.

Is empty or null C#?

In C#, IsNullOrEmpty() is a string method. It is used to check whether the specified string is null or an Empty string. A string will be null if it has not been assigned a value. A string will be empty if it is assigned “” or String.

Why is null a bad idea in Computer Science?

• Essentially in programming null means there is nothing there, and so if you attempt to do an operation on a null value your program will crash. The idea of null has been referenced as the billion dollar mistake (because null pointer exceptions cost companies a lot of money of money), you can read more about why null was a bad idea here.

When is returning null a good or bad design?

• If you're in a language like C# where the idiomatic way of indicating the lack of a value is to return null, then returning null is a good design if you don't have a value. Alternatively, in languages such as Haskell which idiomatically use the Maybe monad for this case, then returning null would be a bad design (if it were even possible).

Why is null bad in an object oriented paradigm?

• NULL is a terrible practice in an object-oriented paradigm and should be avoided at all costs. There have been a number of opinions about this published already, including Null References, The Billion Dollar Mistake presentation by Tony Hoare and the entire Object Thinking book by David West.

Is there anything you can do with null?

• Worse, null is not a value of any type, and there's nothing you can do with it! The programmer can never be sure that a variable actually holds a Foo, and neither can the program; in order to avoid undefined behavior, it has to check variables for "Hello, world!"