Step 2: Perform Math.sin() function on Seed, it will give sin value of that number. Number should be Positive Integer and greater than 1, further explanation in Step 2. However, we can write simple and short function. In PHP, there is function srand(seed) which generate fixed random value for particular seed.īut, in JS, there is no such inbuilt function.

Output = output + longNum.charAt(accumulator) Īccumulator = accumulator + parseInt(newSeed.charAt(counter)) Var y = Math.floor((x - Math.floor(x))*10) Here's an example seed generator based on MurmurHash3's mixing function: function xmur3(str) A good hash function will generate very different results even when two strings are similar. Thankfully, hash functions are very good at generating seeds from short strings. To avoid this, it is best practice to initialize PRNGs with a well-distributed, high entropy seed. a simple seed of 1 and 2) have low entropy, and can cause correlations or other quality issues, resulting in the output having similar properties (such as randomly generated levels being similar).

To keep things simple, the generators below have no built-in seed generating procedure, but accept one or more 32-bit values as the initial seed state of the PRNG. All of them can be seeded and provide high quality numbers.įirst of all, take care to initialize your PRNGs properly.

I've implemented a number of good, short and fast Pseudorandom number generator (PRNG) functions in plain JavaScript.

Number generator