Can a function return nothing?
There is no such thing as “returning nothing” in Python. Every function returns some value (unless it raises an exception). If no explicit return statement is used, Python treats it as returning None . So, you need to think about what is most appropriate for your function.
How do you make a function return nothing?
In lieu of a data type, void functions use the keyword “void.” A void function performs a task, and then control returns back to the caller–but, it does not return a value. You may or may not use the return statement, as there is no return value.
Can a function return null?
If your function is usually returns something but doesn’t for some reason, return null; is the way to go. That’s similar to how you do it e.g. in C: If your function doesn’t return things, it’s void , otherwise it often return either a valid pointer or NULL.
What is void function PHP?
Void functions ¶ Functions declared with void as their return type must either omit their return statement altogether, or use an empty return statement. Attempting to use a void function’s return value simply evaluates to null , with no warnings emitted.
How do you stop a function from returning None?
Your options are:
- return something else if the condition is not met.
- ignore the function if it returns None.
Is return the same as return None?
Yes, they are all the same. We can review the interpreted machine code to confirm that that they’re all doing the exact same thing. They each return the same singleton None — There is no functional difference.
What is none Python?
None is used to define a null value. It is not the same as an empty string, False, or a zero. It is a data type of the class NoneType object. Assigning a value of None to a variable is one way to reset it to its original, empty state.
What is return value in PHP?
PHP Functions returning value return stops the execution of the function and sends the value back to the calling code. You can return more than one value from a function using return array(1,2,3,4). Note that return keyword is used to return a value from a function.
What is the use of return in PHP?
return returns program control to the calling module. Execution resumes at the expression following the called module’s invocation. If called from within a function, the return statement immediately ends execution of the current function, and returns its argument as the value of the function call.
How can I return multiple values from a function in PHP?
PHP doesn’t support to return multiple values in a function. Inside a function when the first return statement is executed, it will direct control back to the calling function and second return statement will never get executed.
Why does my recursive function return None?
Recursive calls are just like any other function call; they return a result to the caller. If you ignore the return value and the calling function then ends, you end up with that calling function then returning None instead.,You are ignoring the return values of recursive calls.