JavaScript Variables and Data Types Worksheet

Question 1

Find a reference that lists all the keywords in the JavaScript programming language.

JavaScript

Question 2

True or false: keywords are NOT case sensitive.

false

Question 3

There are some rules for how you can name variables in JavaScript. What are they?

The name of a variable must begin with a letter,dollar sigh or an underscore, must NOT start with a number. Do not use dash or period in a variable name. Can not use keywords or reserved words. Variables are case sensitive. Use a name the describes the informtion in the variable. Use camel case.

Question 4

What is 'camelCase'?

camelCase is writing phrases without spaces or punctuation and with capitalized words.

Question 5

What are ALL the different data types in JavaScript (note that there are some that we did not discuss in class)?

boolean,string,number.

Question 6

What is the assignment operator and why do they call it 'assignment'?

Replace this text with the solution to the above question/problem.

Question 7

What is a boolean data type?

True or false.

Question 8

What happens if you forget to put quotes around a string when you initialize a variable to a string? How does JavaScript try to interperet this?
For example: var lastName = Jones;

JavaScript thinks it is a number.

Question 9

What character is used to end a statement in JavaScript?

the semicolon

Question 10

If you declare a variable, but do not initialize it, what value will that variable store?

It will store nothing/Undeclared.

Coding Problems

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

Here are some tips to help you with the coding problems:

To do this assignment, you'll need to know how to open the brower's developer tools (press F12) and look at the console log.
Pay extremely close attention to syntax! One little syntax error can mess up your entire program.
After you complete each problem, refresh the page in the browser and look in the console your log message and for errors.
If you have an error in the console, check the line number of the error then look for syntax errors on that line (and the line before and the line after that line).
If you get stuck on this assignment, then ask for help. Dealing with syntax errors can be extremely frustrating for beginners. It takes a lot of help to start to get comfortable with the syntax of a language. Don't be afraid to ask for help, your success in this class will depend on your willingnes to ask for help!