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# How to create a random number in javascript?

## Creating a random number in Javascript

To create a random number in javascript use `Math.random()` built-in function. It returns a floating-point random number between 0 (inclusive) and 1 (exclusive). This number behaves like a seed, it can be scaled to our desired scale.

## Create a random number between 1 and 10

Let's us now scale the random number to get number as we desire. To get a number up to 'n' just multiply the output of `Math.random()` to 'n'.

Since returned number from `Math.random()` is from 0-1 so when the output is multiplied with 'n' then the number will range from 0 to 'n' (not inclusive).

Now add 1 to the number and range becomes 1 to 'n+1' (not inclusive). Since the number is float we use `Math.floor()` to get lower bound of the number, and now number ranges from 0 to n. put `n = 10` to get the desired result.

## Get a random number in range javascript

Using some manipulations you can also get a random number in the range.

You have the max and min of the range. Since

• `Math.random()` range from [0, 1)
• `Math.random() * (max - min + 1)` range from [0, max - min + 1)
• `Math.random() * (max - min + 1) + min` range from [min, max + 1)
• `Math.floor(Math.random() * (max - min + 1))` range from [0, max]

So we can simply create a javascript function to create a number in a range.

## Random Color Javascript

Generate a random color or a random background color for your webpage using the above concept.

Generate a random number from 0 to 9, six times and add these to a string starting with "#" symbol. It will be your random color to use (Hex color).