Difficulty: Medium

Average Score: 60%

A JavaScript programmer defines the following function
function square(number) {
return number * number;
}

Which keyword causes the function to send back a result?

Rationale

Return

The `return` keyword is essential in JavaScript functions as it specifies the value that the function will output after execution. In the provided function, `return number * number;` effectively sends the square of the input number back to the caller of the function.

A (number) YOUR ANSWER

The term `number` in this context is simply the parameter name that represents the input value passed to the function. It does not control the output; rather, it is the variable being manipulated within the function. Therefore, `number` does not cause the function to send back a result.

B (return) CORRECT

This is the correct choice as it directly initiates the process of sending a value back to the function caller. By using the `return` statement, the function concludes its execution and specifies what value will be sent back, which in this case is the square of the input number.

C (function) YOUR ANSWER

The keyword `function` is used to define a new function in JavaScript. It establishes the block of code that will execute when the function is called but does not itself contribute to sending a result back. Thus, it does not impact the output of the function.

D (square) YOUR ANSWER

The term `square` is the name of the function and is used to call or reference the function elsewhere in the code. While it identifies the function, it does not influence the return value produced by the function itself.

Conclusion

In JavaScript, the `return` keyword is pivotal for outputting results from functions. In the example function, it specifically dictates the value that is outputted when the function is executed. Other options, including parameter names and function definitions, do not play a role in determining the return value. Understanding the purpose of the `return` keyword is essential for effective function design and output handling in programming.

Which keyword causes the function to send back a result?

Return

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