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quick-is-prime
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Test if a number is prime in constant time, using a cached Sieve of Eratosthenes. This is especially helpful to test many numbers' primality.
$ npm install quick-is-prime
var isPrime = require('quick-is-prime');
// Simple examples
isPrime(47) // => true
isPrime(48) // => false
isPrime(61) // => true
isPrime(100) // => false
// More challenging examples
isPrime(9998903) // => true, takes 1.5 seconds
isPrime(9893899) // => true, takes less than a millisecond
This module uses a cached Sieve of Eratosthenes for constant time lookup. A new one will be automatically generated if the number you're testing is larger than the currently cached sieve's upper bound.
For best results, check primes highest to lowest. Or alternatively, if you know what the upper bound will be, just check that first to not be concerned with the order.
To run the test suite, first install the dependencies, then run npm test
:
$ npm install
$ npm test
To test code coverage:
$ npm run cover
FAQs
Test if a number is prime in constant time, using a cached Sieve of Eratosthenes.
The npm package quick-is-prime receives a total of 10 weekly downloads. As such, quick-is-prime popularity was classified as not popular.
We found that quick-is-prime demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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