Know How to Find Prime Numbers in JavaScript From Our Sample

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Create a function in JavaScript which determines all prime numbers in a specified range.


This is not too difficult of a problem as long as we understand what a prime number is.

A prime number via Wikipedia is as follows: ”A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.” In most programming languages there is a modulus type function for determining the remainder of a division between two numbers. We can certainly use this concept for determining if a number is prime because a modulus expression will return zero if the number isn’t prime.


function isPrime(value) {

    for(var i = 2; i < value; i++) {

        if(value % i == 0) {

            return false;



return value > 1;


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