drawing cards

drawingCards.js

const cards = [['black', 'black'], ['red', 'red'], ['red', 'black']]
const draw = () => cards[~~(Math.random() * 3)];
var rel = 0; // relevant case count 
var c = 0; // count of cards when we have red on the other side
for (let i = 0; i < 100000; i++) { 
    const [b,f] = draw(); 
    if (f == 'black'|| b=='black') { 
       rel++; 
       if (b == 'red' || f=='red') c++ 
    } 
}; 
console.log(`rel: ${rel}, count: ${c}, p: ${c/rel}`)