JavaScript Functions Worksheet

Question 1

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

Functions break down codes into more smaller, more managable parts.

Question 2

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

Arguments.

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. A function can either return the value (with the return statement being explicit), or (unexplicitly) come back as Undefined if the value dosent include a return statement.

Question 4

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

in JavaScript, "Curly Braces" describe and enclose the beginning/end of a function.

Question 5

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

Executing the code: Entering the functions name, then () parentheses.

Question 6

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

a comma seperates multiple parameters.

Question 7

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


function convertKilometersToMiles(km)
    return km * 0.6217;
}

The "function" value must be enclosed by curly braces.

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 + "!");

Prompt -(returns the value) and alert(displays message).

Coding Problems

Coding Problems - See the 'script' tag below this h3 tag. You will have to write some JavaScript code in it.

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