Random Number Generator

Math.random()

Math.random() function Math.random() function returns a floating-point, pseudo-random number from 0 to less than 1 (inclusive of 0, but not exactly 1) with an approximately uniform distribution over the interval -- which you can then adjust to your desired range. The implementation selects the initial seed to the random number generation algorithm; it cannot be chosen or reset by the user.https://interactive-examples.mdn.mozilla.net/pages/js/math-random.html

Notice: Math.random() does not offer cryptographicall ysecure random numbers. Do not use them for anything that is related to security. Use the Web Crypto API instead, and more precisely the window.crypto.getRandomValues() method.

Syntax 

Math.random()

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Value of Return

A floating-point virtual random number between 1 (inclusive) to one (exclusive).

Examples

Note that as numbers in JavaScript are IEEE 754 floating point numbers with round-to-nearest-even behavior, the ranges claimed for the functions below (excluding the one for Math.random() itself) aren't exact. If extremely large limits are specified (2^53 or higher) is it possible in very very rare circumstances to calculate the usually-excluded upper bound.

Finding the random number between 0 (inclusive) and 1 (exclusive) 

function getRandom()  return Math.random();

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Getting an random numberbetween two values

This example generates a random number between the specified values. The number returned is not less than (and could be equal to) min, but is less than (and less than) max. 

function getRandomArbitrary(min, max)  return Math.random() * (max - min) + min;

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Getting a random integer between two values

This example returns an indeterminate integer with the specified values. It isn't lower than min (or the next integer that is greater then min when min isn't an integer) as well as less than (but not identical to) max. 

function getRandomInt(min, max)  min = Math.ceil(min); max = Math.floor(max); return Math.floor(Math.random() * (max - min) + min); //The maximum is exclusive and the minimum is inclusive

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Note: It might be tempting to utilize Math.round() to achieve this, however doing this could cause that your random numbers to follow a non-uniform distribution, which might not be suitable for your needs.

Getting a random integer between two values, inclusive

The use of the() function above is inclusive at minimum, it's not inclusive at the maximum. What happens if you want the results to be inclusive both at the minimum and at the highest? The getRandomIntInclusive() function below accomplishes that. 

function getRandomIntInclusive(min, max)  min = Math.ceil(min); max = Math.floor(max); return Math.floor(Math.random() * (max - min + 1) + min); //The maximum is inclusive and the minimum is inclusive

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