JavaScript Functions Worksheet

Question 1

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

Encapsulates code to be repeated, executed, and accessed easily.

Question 2

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

Arguments or parameters.

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.)

They all return something, if you consider null something.

Question 4

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

The code between the curly braces after the funtion's name.

Question 5

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

To execute the function and the applicable code inside of it.

Question 6

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

Comma,

Question 7

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


function convertKilometersToMiles(km)
    return km * 0.6217;
}

There are no curly braces to encapsulate the body code.

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 prompt() function returns variable "name" because it stored in the variable "name";

Coding Problems

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