1 Variable Names
2 Variable Values
1 Variable Names
3 let and const Diffenrences
• We use const to declare variables whose values are not supposed to change. const is short for "constant".
• However, we can update let variables with the assign = operator.
To make it obvious that a variable is of type const and shouldn't change, we can optionally name it with uppercase letters. Create an uppercase birthday constant.
const BIRTHDAY = "25/02/1882";
We cannot use camelCase if we use this uppercase standard, so we use an uppercase snake_case to name variables with more than one word. Create an uppercase "speed of light" const using snake_case.

What's the optional standard to make sure constants don't change their values?
uppercase
What should we use as a default?
const
4 Console
With the special instruction console.log(), we tell the computer to display a value in an area called the console.
CONSOLE LOG

GREETING

• We learned how to create and store values, but how do we compare them?
• We need to compare numbers in situations like checking a user's entered PIN matches their saved PIN.

const enteredPin = 5448;
const expectedPin = 5440;

To compare if two numbers are the same, we use the equality operator, ===.

5===5

EXAMPLES

When checking if a player's number of lives remaining is exactly 5

To check if a number isn't equal to another number, we use the inequality operator, !==.

Eg: console.log(10!==11)

We can store the result of a comparison with the inequality operator in a variable. Save the comparison between 1 and 2 into the variable result.

const result = 1 !== 2;
console.log(result);

We can use comparisons to check if a number is less than or greater than another number.

What do we call the > sign? greater than