Javascript Random

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Math.random() #

Math.random() returns a random number between 0 (inclusive),  and 1 (exclusive):

Example #

Math.random(); // returns a random number

Math.random() always returns a number lower than 1.

JavaScript Random Integers #

Math.random() used with Math.floor() can be used to return random integers.

Example #

Math.floor(Math.random() * 10); // returns a random integer from 0 to 9

Example #

Math.floor(Math.random() * 11); // returns a random integer from 0 to 10

Example #

Math.floor(Math.random() * 100); // returns a random integer from 0 to 99

Example #

Math.floor(Math.random() * 100); // returns a random integer from 0 to 99

Example #

Math.floor(Math.random() * 101); // returns a random integer from 0 to 100

Example #

Math.floor(Math.random() * 10) + 1; // returns a random integer from 1 to 10

Example #

Math.floor(Math.random() * 100) + 1; // returns a random integer from 1 to 100

A Proper Random Function #

As you can see from the examples above, it might be a good idea to create a proper random function to use for all random integer purposes.

This JavaScript function always returns a random number between min (included) and max (excluded):

Example #

Math.floor(Math.random() * 10) + 1; // returns a random integer from 1 to 10

This JavaScript function always returns a random number between min and max (both included):

Example #

function getRndInteger(min, max) { return Math.floor(Math.random() * (max - min + 1) ) + min; }
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