In JavaScript, you can use the `Math. random()`

function to generate a pseudo-random floating number between 0 (inclusive) and 1 (exclusive).

```
const random = Math.random()
console.log(random)
// 0.5362036769798451
```

If you want to get a random number between 0 and 20, just multiply the results of `Math.random()`

by 20:

```
const random = Math.random() * 20
console.log(random)
// 15.40476356200032
```

To generate a random whole number, you can use the following `Math`

methods along with `Math.random()`

:

`Math.ceil()`

— Rounds a number upwards to the nearest integer`Math.floor()`

— Rounds a number downwards to the nearest integer`Math.round()`

— Rounds a number to the nearest integer

Let us use `Math.floor()`

to round the floating number generated by `Math.random()`

to a whole number:

```
const random = Math.floor(Math.random() * 20)
console.log(random)
// 12
```

Now we have learned that how to generate a whole random number, let us write a function that takes in an integer as input and returns a whole number between 0 and the integer itself:

```
const random = (max = 50) => {
return Math.floor(Math.random() * max)
}
console.log(random(100))
// 66
```

To generate a random number between two specific numbers (`min`

included, `max`

excluded), we have to update the `random()`

method like below:

```
const random = (min = 0, max = 50) => {
let num = Math.random() * (max - min) + min
return Math.floor(num)
}
console.log(random(10, 40))
// 28
```

In the above code, we used `(max - min) + min`

to avoid cases where the `max`

number is less than the `min`

number.

To generate a random number that includes both `min`

and `max`

values, just change `Math.floor()`

to `Math.round()`

:

```
const random = (min = 0, max = 50) => {
let num = Math.random() * (max - min) + min
return Math.round(num)
}
console.log(random(10, 70))
// 51
```

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