<==Back

Reading

From the Duckett HTML book:

- Chapter 2: “Text” (pp.40-61)
- Chapter 10: Ch.10 “Introducing CSS” (pp.226-245)

From the Duckett JS book:

- Chapter 2: “Basic JavaScript Instructions” (pp.53-84)
- Chapter 4: “Decisions and Loops” only up to the section on switch statements (pp.145-162)

let axe = 3

• var today = new Date();
• var hourNow = today.getHours();

• var greeting;

• ` if(hourNow > 18){`
• greeting = 'good evening' ;
• } else if (hourNow > 12) {
• greeting = 'good morning' ;
• } else {
• greeting = 'welcome' ;
• }
• document.write(greeting);

/* This is commented out multi line*/

<!-- or this -->

scripts store data in variables

Step #1

Declare Variable var quantity; Assign Value quantity = 6;

Numeric Data Type

0.45

String Data Type

'Hello world!'

BOOLEAN Data Type

True or False

Remember the 6 Rules of naming a variable:

Check page 69 in the book to see the rules.

An array can store a list of values

-use when working with values that are related to eachother.

An expression evaluates into a single calue

• one type assign a value to a variable

var color = 'blue';

• another uses two or more values to return a single value

var volume = 4 * 4 * 5;

Expressions rely on operators to allow creation of a single value from one or more.

### arithmetic operators

• addition +
• subtraction -
• division /
• multiplication *
• increment ++ (adds one to current)
• decrement -- (subtracts one from current)
• modulus % (divides two values, returns remainder)

REMEMBER

• scripts are like recipes
• precise recipes..
• varibles store info
• JS distinguishes between numbers, strings, and boolean values.
• expressions evaluate into a single value and rely on operators