Can you return nothing in JavaScript?

Can JavaScript function return nothing?

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.

What happens if a function returns nothing?

You may or may not use the return statement, as there is no return value. Even without the return statement, control will return to the caller automatically at the end of the function. A good utilization of a void function would be to print a header/footer to a screen or file.

Do all JavaScript functions have a return?

Every function in JavaScript is a Function object. … 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 .

Is it possible to return nothing?

No, it’s not possible simply because None is nothing. The best you can do is retval = crawl(); if retval: found. append(retval) .

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What is return in JavaScript?

The return statement is used to return a particular value from the function to the function caller. The function will stop executing when the return statement is called. The return statement should be the last statement in a function because the code after the return statement will be unreachable.

What is JavaScript void?

void is an important keyword in JavaScript which can be used as a unary operator that appears before its single operand, which may be of any type. This operator specifies an expression to be evaluated without returning a value.

Does return type void?

______________ have the return type void. Explanation: Constructor creates an Object and Destructor destroys the object. They are not supposed to return anything, not even void. … Explanation: void fundamental type is used in the cases of a and c.

Why do we use void as it is returning nothing?

void is a type to represent nothing. That is a subtle difference : the representation is still required, even though it represents nothing. This type is used as function’s return type which returns nothing. This is also used to represent generic data, when it is used as void* .

How does a function return a value?

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.

Do you always have to return something from 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.

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Should a function always return a value JavaScript?

4 Answers. All JavaScript functions return something. If an explicit return is omitted, undefined is returned automatically instead. … To my knowledge, unless you need it to return something, a function doesn’t have to return anything.

Should every function return a value?

No, If a function return type is declared as void it cannot return any value. 1. If a function contains two return statements successively, the compiler will generate warnings. …

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