primenumb/index.js

List or sum given number of prime numbers.

exports.primenumb = function(nthp, liststuff)
{
	if (!nthp)
	{
		console.log('You need to specify how many prime numbers you need. This is the first parameter. Zero is not an option.');
		return false;
	}

	if (!liststuff)
	{
		console.log('You haven\'t specified if you need a list or not, so I\'ll give you a list.');
		liststuff = true;
	}

	function isPrime(num)
	{
		if (num < 2)
			return false;

		for (var i = 2; i < num; i++)
			if (num % i == 0)
				return false;

		return true;
	}

	function countPN(nthprime)
	{
		if (!nthprime) return false;

		var result = 0, cntr = 0, primecntr = 0;
		while (true)
		{
			if (isPrime(cntr))
			{
				if (liststuff)
					console.log('Prime number: '+cntr);
				else
					result += cntr;

				primecntr++;
			}
			if (primecntr >= nthprime)
				break;
			cntr++;
		}

		if (!liststuff)
		{
			console.log('The result is: ' + result);
			return result;
		}
		console.log(cntr + ' number'+(cntr > 1 ? 's' : '')+' checked, ' + primecntr +' prime found.');
		return true;
	}

	countPN(nthp);
}