JavaScript Functions Worksheet

Question 1

What is a function, and why would you ever want to use one in your code?

A reusable block of code the performs a specific task. It improves code readability and avoid repetition.

Question 2

What do you call the values that get passed into a function?

Paremeters

Question 3

Do all functions return a value? (Note: this is a bit of a trick question - make sure to ask me about this in class.)

No, not all functions return a value.

Question 4

What is the 'body' of a function, and what are the characters that enclose the body of a function?

Block of code that contains logic function executes, and this is the character {}.

Question 5

What does it mean to 'call', or 'invoke' a function (note that 'calling' and 'invoking' a function mean the same thing)?

Execute the code inside the function.

Question 6

If a function has more than one parameter, what character do you use to separate those parameters?

If it has more then one parameter, seperate it with a comma.

Question 7

What is the problem with this code (explain the syntax error)?


function convertKilometersToMiles(km)
    return km * 0.6217;
}

Return km * 0.6217 isn't inside the {}

Question 8

In the code below, there are two functions being invoked. Which one returns a value? Explain why you know this.


const name = prompt("Enter your name");
alert("Hello " + name + "!");

The alert is a dialog box while the other returns a value. The promp() collects user input and returns it as a string.

Coding Problems

Always test your work! Check the console log to make sure there are no errors.