Do functions in JavaScript necessarily return a value? Explanation: Functions generally have a return statement and hence usually returns a value. Some functions which does not have a return statement returns value by default during execution.

Do JavaScript functions have to return a value?

So to recap: No, a JS function needn't return anything as far as your code goes. But as far as the JS engines are concerned: a function always returns something, be it explicitly via a return statement, or implicitly. If a function returns implicitly, its return value will always be undefined.

Does a function have to return a value?

If a function is defined as having a return type of void , it should not return a value. ... If a function is defined as having a return type other than void , it should return a value.

Do all functions have return values?

To return a value other than the default, a function must have a return statement that specifies the value to return. A function without a return statement will return a default value. ... For all other functions, the default return value is undefined .

How do you return a Javascript function?

In Javascript, functions are just objects, like any other object. If you find that not helpful, just replace the word "object" with "thing". You can return any object from a function. You can return a true/false value.

Return Values from JavaScript Functions

39 related questions found

Can function return multiple values?

You can return multiple values from a function using either a dictionary, a tuple, or a list. These data types all let you store multiple values.

How would you return a value from a function?

To return a value from a function, you must include a return statement, followed by the value to be returned, before the function's end statement. If you do not include a return statement or if you do not specify a value after the keyword return, the value returned by the function is unpredictable.

What function returns when the return value of some function is not defined within the function?

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.

Can a function return a variable?

A function is not required to return a variable, it can return zero, one, two or more variables.

When a function doesn't need to return anything what should be its return type?

When a function does not return a value, void is the type specifier in the function declaration and definition. A function cannot be declared as returning a data object having a volatile or const type, but it can return a pointer to a volatile or const object.

Can a function return two values back to the main function?

No, you can not have two returns in a function, the first return will exit the function you will need to create an object.

What is the default return value for a function that does not return any value explicitly?

The default return value from a function is int. Unless explicitly specified the default return value by compiler would be integer value from function.

Can a function can return more than 1 value True False?

Explanation: True, A function cannot return more than one value at a time. because after returning a value the control is given back to calling function.

When function does not return any value then function is declared as void True or false?

Explanation: True, A function cannot return more than one value at a time. because after returning a value the control is given back to calling function.

Is it possible that a function have more than one return statements Yes or no?

The question is whether a method may have multiple return statements or just one. ... Yes, just a return statement and that's it. No other operators or statements.

Can a function return a struct?

You can return a structure from a function (or use the = operator) without any problems. It's a well-defined part of the language. The only problem with struct b = a is that you didn't provide a complete type.

When a function does not return any value what is the by default return value for that function in Python?

That default return value will always be None . If you don't supply an explicit return statement with an explicit return value, then Python will supply an implicit return statement using None as a return value. In the above example, add_one() adds 1 to x and stores the value in result but it doesn't return result .

What is default return value if it is not specified in function definition?

If expression is omitted, the return value of the function is undefined. ... If a return value isn't required, declare the function to have void return type. If a return type isn't specified, the C compiler assumes a default return type of int .

Which type of value does the function return by default?

The default returns value from a function in int. In other words generally unless explicitly specified the default return value by compiler would be integer value from function.

Can a function return more than one data if needed to return more than one data how do you arrange?

We can return more than one values from a function by using the method called “call by address”, or “call by reference”. In the invoker function, we will use two variables to store the results, and the function will take pointer type data. So we have to pass the address of the data.

Can a function return multiple values justify giving example?

A function is not restricted to return a variable, it can return zero, one, two or more values. This is the default property of python to return multiple values/variables which is not available in many other programming languages like C++ or Java.

Can function return more than one value in Plsql?

2) Yes. In functions are allowed using IN and OUT parameters.

What value do functions that do not contain return statement return?

If a function doesn't specify a return value, it returns None . In an if/then conditional statement, None evaluates to False.

When a function returns no value its return type?

Void Functions

If a function does not return a value, then a special "TYPE" is used to tell the computer this. The return type is "void" (all lower case). Void functions are mostly used in two classes of functions.

What does the return function do in Javascript?

The return statement stops the execution of a function and returns a value from that function.