## Question

What does `i++`

and `i--`

mean?

## Answer

The `++`

and `--`

are the *increment* and *decrement* operators, respectively. The *increment* operator adds 1 to the operand and the *decrement* operator subtracts 1 from the operand.

Increment example:

```
let x = 10;
while(x < 20) { //when x is less than 20
x++; //add 1 to x
console.log(x); //logs the numbers 11 - 20 to the console
}
```

Decrement example:

```
let x = 10;
while(x > 0) { //when x is greater than 0
x--; //subtract 1 from x
console.log(x); //logs the numbers 9 - 0 to the console
}
```