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# Compare numbers

Numbers can be compared with the well-known mathematical symbols.
In the following examples, all expressions return the value

`true`

.
```
let v1 = 5 > 4;
let v2 = 5 >= 5;
let v3 = 5 < 6;
let v4 = 5 <= 5;
```

## Exercise

Write a function

Example:

`isThreeDigit`

that checks if a number is greater than
or equal to 100 and less than 1000.Example:

`isThreeDigit(500)`

should return `true`

and `isThreeDigit(50)`

should return `false`

.
+ Hint

```
function isThreeDigit(x) {
return x >= 100 && ...
}
```

+ Solution

```
function isThreeDigit(x) {
return x >= 100 && x < 1000;
}
```