mskt3d.js

var numbers = [4, 6, 7, 8, 34, 54, 5, 3, 63, 76];

function isPrime(num) {
    for (var i = 2; i < num; i++)
        if (num % i === 0) return false;
    return num !== 1;
}

function isPrimeArray(anyArray) {
    if (!anyArray.length)
        return null
    var resp = {
        prime: [],
        composite: []
    }
    for (var n of anyArray) {
        if (isPrime(n))
            resp.prime.push(n)
        else
            resp.composite.push(n)
    }
    return resp
}

function outputPrime(value) {
    console.log(value)
}

function mskt3d(anyArray2, callback1, callback2) {
    var isPr = isPrimeArray(anyArray2)
    callback1(isPr.prime)
    callback1(isPr.composite)
    return isPr
}
mskt3d(numbers, outputPrime, outputPrime)