The `Math.random()`

method is one of JavaScript’s Math object method that returns a positive random number that’s lower than 1, meaning it can generate a random number between `0`

and `0.99999999999999999`

```
console.log(Math.random());
// 0.35574907184159277
console.log(Math.random());
// 0.7612336564594773
console.log(Math.random());
// 0.669688248313085
console.log(Math.random());
// 0.8246898327750964
```

This method doesn’t receive any parameters.

## Generating integer numbers within a range

This number returned by this method can be used as the spark to generate a random number between a specified range of your choosing. For example, let’s say you want to generate a random number between `50`

to `60`

. Here’s how you do it:

```
const randomNum = Math.random();
const randomBetween = randomNum * (6 - 50) + 50;
```

The math formula is as follows:

```
randomNum * (max - min) + min
```

However, since the random number generator can only generate numbers lower than 1, this means you will only receive numbers between `50`

and `59.99...`

to include the maximum number into the random generator, you need to add a `+ 1`

into the formula:

```
randomNum * (max - min + 1) + min
```

But we’re not done yet here! The formula above will return a number between `50`

and `60.99...`

```
0.999 * (60 - 50 + 1) + 50 = 60.98900
```

The random number will never return `61`

, so all you need to do is to round the number down with the `Math.floor()`

method:

```
Math.floor(0.999 * (60 - 50 + 1) + 50);
// returns 60
```

The complete formula is as follows:

```
const randomNum = Math.random();
const min = 50;
const max = 60;
const randomBetween = randomNum * (max - min + 1) + min;
const randomInteger = Math.floor(randomBetween);
```

Now you can generate a random number between `50`

to `60`

, although you can’t generate a decimal number this way.

## Generating decimal numbers within a range

If you want your random generator to also allows decimal numbers, you need to replace the generated number with `max`

only when the `randomBetween`

value is higher than `max`

:

```
const randomNum = Math.random();
const min = 50;
const max = 60;
let randomBetween = randomNum * (max - min + 1) + min;
if (randomBetween > max) {
randomBetween = max;
}
```

Now you can have decimal numbers between the specified range.

**More on JavaScript:**