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50 lines
1.3 KiB
50 lines
1.3 KiB
4 weeks ago
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# seed
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You can also instantiate your own instance of Chance with a known seed. This is
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useful for creating repeatable results.
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```js
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var chance1 = new Chance(12345);
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var chance2 = new Chance(12345);
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// These yield the same values, in sequence
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console.log(chance1.random());
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console.log(chance2.random());
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```
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Since both copies of Chance had the same seed, they will both generate the same
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random number sequence each time they're called.
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This allows for repeatability, if desired.
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This is possible because **Chance** is built atop a [Mersenne Twister][mersenne],
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a pseudo-random number generator which produces repeatable results given the same seed.
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Optionally provide the seed as a string.
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```js
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var chance1 = new Chance("foo");
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var chance2 = new Chance("bar");
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// These will be different
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console.log(chance1.random());
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console.log(chance2.random());
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```
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Optionally provide multiple arguments as the seed.
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```js
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var chance1 = new Chance("hold", "me", "closer");
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var chance2 = new Chance("tony", "danza");
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var chance3 = new Chance("hold", "me", "closer");
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// These will be different
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console.log(chance1.random());
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console.log(chance2.random());
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// This will be the same as the value from chance1 above
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console.log(chance3.random());
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```
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[mersenne]: http://en.wikipedia.org/wiki/Mersenne_twister
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