Do you need a return for a function?
NO, a function does not always have to have an explicit return statement. If the function doesn’t need to provide any results to the calling point, then the return is not needed.
To put it simply a continuation is a function which is used in place of a return statement. More formally: A continuation is a function which is called by another function. The last thing the other function does is call the continuation.
Why do we use return?
A return statement ends the execution of a function, and returns control to the calling function. Execution resumes in the calling function at the point immediately following the call. A return statement can return a value to the calling function.
You use return false to prevent something from happening. So if you have a script running on submit then return false will prevent the submit from working. When a return statement is called in a function, the execution of this function is stopped. If specified, a given value is returned to the function caller.
A function without a return statement will return a default value. In the case of a constructor called with the new keyword, the default value is the value of its this parameter. For all other functions, the default return value is undefined .
When a return statement is used in a function body, the execution of the function is stopped. If specified, a given value is returned to the function caller. For example, the following function returns the square of its argument, x , where x is a number. If the value is omitted, undefined is returned instead.
“Blank return” statements can be used to transfer the control back to the calling function (or stop executing a function for some reason – ex: validations etc). In most cases I use blank return statement is when I’m doing some kind of a validation.
A function can have more than one return statement, but only ever run one based on a condition.
Should I use print or return?
Use print when you want to show a value to a human. return is a keyword. When a return statement is reached, Python will stop the execution of the current function, sending a value out to where the function was called. Use return when you want to send a value from one point in your code to another.
Which function should not return any value?
Void functions are created and used just like value-returning functions except they do not return a value after the function executes. 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.
Do all functions need a return statement?
Regardless of how long and complex your functions are, any function without an explicit return statement, or one with a return statement without a return value, will return None .