prime.js

const getPrimes = function(n) {
    const result = []

    for ( let i=2;i<=n;++i ) {
        if ( getPrimes.isPrime(i) ) {
            result.push(i)
        }
    }

    return result
}

getPrimes.isPrime = function(n) {
    if ( n < 2 ) { return false }

    for ( let i=2; i<n; ++i ) {
        if ( n%i == 0 ) {
            return false
        }
    }

    return true
}

console.log(getPrimes(1000))