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Showing content from https://webplatform.github.io/docs/javascript/Math/random below:

random · WebPlatform Docs

random Summary

Returns a pseudorandom number between 0 and 1.

Syntax

Math.random( )

Examples

Math.random(); 
Math.random(); 
Math.random();

Remarks

The pseudo-random number generated is from 0 (inclusive) to 1 (exclusive), that is, the returned number can be zero, but it will always be less than one. The random number generator is seeded automatically when JavaScript is first loaded.

Due to the nature of the generation methods, these pseudo-random numbers are not uniformly distributed. They are normally distributed which means that, in general, a number is more likely to be closer to 0.5 than 0 or 1.

Note that this method is unsuitable for cryptography. The WebCrypto API addresses this.