Guessing Game Simulator

guessing-game

function guessingGame(testcases, useMidPoint) {
    useMidPoint = useMidPoint || false;
	var correct = i = 0,
		r = Math.random;
    
	for (i=testcases;i;i--) {
		var a = r(), b = r(), k = useMidPoint ? 0.5 : r();
		correct += (k < a && a > b) || (k > a && a < b);
	}
	
	console.log(correct / testcases);
}

guessing-game test

// Use a random for K, 100 testcases
guessingGame(100); // ~0.66

// Use a random for K, 1 milion testcases
guessingGame(1000000); // ~0.66

// Use 0.5 instead of random for K, 100 testcases
guessingGame(100, true); // ~0.75