Solving the Monty Hall Problem 1000 Times.

montyhall.js

var doors = [];
var temp;

//NO SWITCH
var firstGuess;
var doorOpen;
var noSwtichcorrect=0;
var noSwitchwrong=0;

function placeCar(){
	for(;;){
		if((doors.length === 3)&&(doors.indexOf('car')===-1)){
			doors = [];
			continue;
		}
		else if((doors.length === 3)&&(doors.indexOf('car')!==-1)){
			break;
		}
		else{
			temp = Math.random(); //number between 0-1
			if((temp >= 0.5)&&(doors.indexOf('car')===-1)){doors.push('car');}
			else{doors.push('goat');}	
		}
	}
}

//NO SWITCH
for(var i=0;i<1000;i++){
	placeCar();
	firstGuess = Math.floor(Math.random(1)*(4-1)+1);
	if(doors.indexOf('car') === (firstGuess-1)){noSwtichcorrect++;}
	else{noSwitchwrong++;}
}

console.log("No Switch Correct: "+noSwtichcorrect/10+"%, and No Switch Wrong: "+noSwitchwrong/10+"%");

var Swtichcorrect=0;
var Switchwrong=0;

//SWITCH
for(var j=0;j<1000;j++){
	placeCar();
	firstGuess = Math.floor(Math.random(1)*(4-1)+1);//1,2,3

	for(;;){
		doorOpen = Math.floor(Math.random(1)*(4-1)+1);//1,2,3
		if(doorOpen === firstGuess){continue;}
		else{break;}
	}

	if((firstGuess === 1)&&(doorOpen===2)){firstGuess=3;}
	if((firstGuess === 1)&&(doorOpen===3)){firstGuess=2;}
	if((firstGuess === 2)&&(doorOpen===1)){firstGuess=3;}
	if((firstGuess === 2)&&(doorOpen===3)){firstGuess=1;}
	if((firstGuess === 3)&&(doorOpen===1)){firstGuess=2;}
	if((firstGuess === 3)&&(doorOpen===2)){firstGuess=1;}

	if(doors.indexOf('car') === (firstGuess-1)){Swtichcorrect++;}
	else{Switchwrong++;}

}

console.log("Switch Correct: "+Swtichcorrect/10+"%, and Switch Wrong: "+Switchwrong/10+"%");