Is it better to return null or empty string?

you can usually simply return an empty object instead of null , and it will work fine, without special handling. In these cases, there's usually no need for the caller to explicitly handle the empty case.

Which is better empty string or null?

So it is better to use empty string for database as allowing NULL value forces the system to do extra work and does not give the data that you are looking for. However, NULL does not throw any exception when the count() function is executed.

Should I return null or empty?

Generally it's best to return empty collections, but sometimes (rarely): null might mean something more specific; your API (contract) might force you to return null .

Is it good practice to return null?

Returning null Creates More Work

An ideal function, like an assistant cook, will encapsulate work and produce something useful. A function that returns a null reference achieves neither goal. Returning null is like throwing a time bomb into the software. Other code must a guard against null with if and else statements.

Should API return null or empty string?

If you usually return an array, and empty array is probably a good choice. But if you usually return an object, then, IMHO, null is acceptable and may be better than an empty object. If you usually return just a string or a number, then null would probably be the preferred choice.

Null String vs Empty String in Java

What happens if you send a null value in an API call?

If a "NULL" is passed in the JSON, we get NULL in the object, but any other field that is not passed is NULL as well. Therefore we cannot distinguish which field can be deleted and which field cannot be touched. The complete object is sent.

How do you handle a null response in JSON?

Is it bad practice to return null in Java?

Returning Null is Bad Practice

The FirstOrDefault method silently returns null if no order is found in the database. There are a couple of problems here: Callers of GetOrder method must implement null reference checking to avoid getting a NullReferenceException when accessing Order class members.

Should I return null JavaScript?

JavaScript uses the null value to represent the intentional absence of any object value. If you find a variable or a function that returns null , it means that the expected object couldn't be created.

Should you return null C#?

Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies data has been returned, whereas returning null clearly indicates that nothing has been returned.

Is Empty list same as null?

An empty collection isn't the same as null . An empty collection is actually a collection, but there aren't any elements in it yet. null means no collection exists at all.

How do I return nothing in string?

To fix this use an if statement! static String concatAll(Object[] things) { if(things == null) { return null; } ...continue code.... This will first check things for a null value BEFORE executing code that could throw an exception. The NPE will be thrown by things.

How do you return an empty string list?

emptyList() returns an immutable list, i.e., a list to which you cannot add elements if you want to perform any operation on your list, then create new instance of list and return it. if (isValidLang(lang)) { query. setParameter("lang", lang); return query.

IS NULL same as empty string in SQL?

NULL is used in SQL to indicate that a value doesn't exist in the database. It's not to be confused with an empty string or a zero value. While NULL indicates the absence of a value, the empty string and zero both represent actual values.

What is the use of empty strings in Python?

What does the empty string "" represent? It tests whether the string has nothing in it. variable begin not would be an empty string.

Is empty string same as NULL in C?

An empty string has a single element, the null character, '\0' . That's still a character, and the string has a length of zero, but it's not the same as a null string, which has no characters at all.

Is it better to use undefined or null?

Only use null if you explicitly want to denote the value of a variable as having "no value". As @com2gz states: null is used to define something programmatically empty. undefined is meant to say that the reference is not existing. A null value has a defined reference to "nothing".

Is it bad to return undefined?

A function returns undefined if a value was not returned . Note: While you can use undefined as an identifier (variable name) in any scope other than the global scope (because undefined is not a reserved word), doing so is a very bad idea that will make your code difficult to maintain and debug.

Which function should never be used to run JavaScript?

Avoid Using eval()

In almost all cases, it should not be necessary to use it. Because it allows arbitrary code to be run, it also represents a security problem.

Why is nullable bad?

NULL exacerbates poor language decisions

Java silently converts between reference and primitive types. Add in null, and things get even weirder. though it throws a NullPointerException when run. It's bad enough that member methods can be called on null; it's even worse when you never even see the method being called.

Should we pass null as argument in Java?

You cannot pass the null value as a parameter to a Java scalar type method; Java scalar types are always non-nullable. However, Java object types can accept null values. The values of both variable <@I> and variable <@A> are null, since values have not been assigned to them.

Is it good practice to use null in Java?

The best way to avoid NPE's is to never allow a null to be assigned with good coding habits. So my answer is: you check for nulls if you are working on bad code. You just have to. But if it's all your code, you should never be returning nulls or assigning them.

How do I ignore empty values in JSON response?

You can ignore null fields at the class level by using @JsonInclude(Include. NON_NULL) to only include non-null fields, thus excluding any attribute whose value is null. You can also use the same annotation at the field level to instruct Jackson to ignore that field while converting Java object to json if it's null.

Is null a valid value in JSON?

One of the changes in RFC 7159 is that a JSON text is not defined as being an object or an array anymore but rather as being a serialized value. This means that with RFC 7159, “null” (as well as “true” and “false”) becomes a valid JSON text. So the JSON text serialized value of a null object is indeed “null”.

Can you pass null in JSON?

Passing a null value to any Corticon Server using JSON payloads is accomplished by either: Omitting the JSON attribute inside the JSON object. Including the attribute name in the JSON Object with a value of JSONObject.