function generateString(base, length)
{
	return ...Math.random().toString(base).substr(2, lenth)
}

function alternateString(str)
{
	return str.map(element => (Math.random() > 0.5 ? element : element.toUpperCase())).join('');
}

function randomString(base, length)
{
	generatedString = generateString(base, length);
	alternateString(generatedString);

	return generatedString;
}

//

var mujstring = randomString(36, 5);