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Generating Random Prime Number in JavaScript
We are required to write a JavaScript function that takes in two numbers specifying a range. Our function should return a random prime number that falls in that range
Example
The code for this will be −
const range = [100, 1000]; const getPrimes = (min, max) => { const result = Array(max + 1) .fill(0) .map((_, i) => i); for (let i = 2; i <= Math.sqrt(max + 1); i++) { for (let j = i ** 2; j < max + 1; j += i) delete result[j]; } return Object.values(result.slice(min)); }; const getRandomNum = (min, max) => { return Math.floor(Math.random() * (max − min + 1) + min); }; const getRandomPrime = ([min, max]) => { const primes = getPrimes(min, max); return primes[getRandomNum(0, primes.length − 1)]; }; console.log(getRandomPrime(range));
Output
And the output in the console will be −
311
Output is likely to differ in each run.
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