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Commit 0084acf

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algorithm: sieve (TheAlgorithms#1205)
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‎Maths/SieveOfEratosthenesIntArray.js

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/**
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* Function to get all prime numbers below a given number
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* This function returns an array of prime numbers
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* @see {@link https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes}
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*/
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function sieveOfEratosthenes (max) {
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const sieve = []
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const primes = []
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for (let i = 2; i <= max; ++i) {
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if (!sieve[i]) { // If i has not been marked then it is prime
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primes.push(i)
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for (let j = i << 1; j <= max; j += i) { // Mark all multiples of i as non-prime
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sieve[j] = true
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}
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}
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}
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return primes
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}
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export { sieveOfEratosthenes }
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import { sieveOfEratosthenes } from '../SieveOfEratosthenesIntArray'
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import { PrimeCheck } from '../PrimeCheck'
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describe('should return an array of prime numbers', () => {
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it('should have each element in the array as a prime numbers', () => {
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const n = 100
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const primes = sieveOfEratosthenes(n)
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primes.forEach(prime => {
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expect(PrimeCheck(prime)).toBeTruthy()
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})
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})
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})

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