Quick Answer: What happens when JavaScript function reaches a return statement?

When JavaScript reaches a return statement, the function will stop executing. If the function was invoked from a statement, JavaScript will “return” to execute the code after the invoking statement.

What happens when you return a function JavaScript?

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.

What happens when JavaScript function reaches a return statement Mcq?

Explanation: The return stops the execution of the function when it is encountered within the function. It returns the value to the statement where the function is called.

Does a return statement end a function JavaScript?

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

What is the purpose of a return statement in a function 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.

IT IS IMPORTANT:  Is react like PHP?

What is it called when a function returns a function?

In mathematics and computer science, a higher-order function is a function that does at least one of the following: takes one or more functions as arguments (i.e. a procedural parameter, which is a parameter of a procedure that is itself a procedure), returns a function as its result.

Do JavaScript functions need return?

No; Javascript functions are not required to return a value. If you call a function that doesn’t return a value, you’ll get undefined as the return value.

What is the purpose of return statement in a function Mcq?

The return statement causes the function to stop executing and to return the value of its expression (if any) to the caller.

Do functions in JavaScript necessarily return a value Mcq?

2. 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.

What is the main use of JavaScript Mcq?

Explanation: JavaScript is designed for the following purpose: to style HTML pages b. to execute Queries related to databases on a server c. to add interactivity to html pages d. to perform server side scripting operations e.

Why does function return undefined JavaScript?

undefined is a property of the global object. … A variable that has not been assigned a value is of type undefined . A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .

How do you return text in JavaScript?

To return a string from a JavaScript function, use the return statement in JavaScript.

IT IS IMPORTANT:  Will upgrading PHP break my site?

How do you return a function in JavaScript?

JavaScript passes a value from a function back to the code that called it by using the return statement. The value to be returned is specified in the return. That value can be a constant value, a variable, or a calculation where the result of the calculation is returned.

What does empty return mean in JavaScript?

“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.

Categories PHP