random select with rates

random.js

// https://jsfiddle.net/c7584nqt/2/

function isFair(player1, player2) {
	let sum = player1.rate + player2.rate;
  if (sum == 4 || sum == 1) {
    return false;
  }
  return true;
}

let players = [
	{ name: 'Apu', rate: 2 },
  { name: 'Walter', rate: 2 },
  { name: 'Aurelio', rate: 2 },
  { name: 'Cesar', rate: 2 },
  { name: 'Jeff', rate: 2 },
  { name: 'Claudio', rate: 1 },
  { name: 'Daniel', rate: 1 },
  { name: 'Regis', rate: 1 },
  { name: 'Big', rate: 1 },
  { name: 'Lucas', rate: 1 },
  { name: 'Vagner', rate: 0 }
];
let pairs = [];

while(players.length > 0) {
	let rand = Math.floor(Math.random() * players.length);
	let player1 = players.splice(rand, 1).shift();

	if(players.length > 0) {
    rand = Math.floor(Math.random() * players.length);
    let player2 = players.splice(rand, 1).shift();

    while(!isFair(player1, player2) && players.length > 0) {
      console.log("NOT FAIR: " + player1.name + " e " + player2.name);
      players.push(player2);
      rand = Math.floor(Math.random() * players.length);
      player2 = players.splice(rand, 1).shift();
    }

    let pair = [player1, player2];
    pairs.push(pair);

    document.getElementByID('pairs').append(pair[0].name + " e " + pair[1].name);
  } else {
    console.log(player1.name + " sobrou!");
  }
}