test.js

const calculateEloPoint = (data) => {
  const eloA = parseInt(data.eloA);
  const eloB = parseInt(data.eloB);
  const goalA = parseInt(data.goalA);
  const goalB = parseInt(data.goalB);
  try {
    const diffGoal = Math.abs(goalA - goalB);
    const diffElo = (eloA - eloB);
    
    // G
    let G = 0;
    if (diffGoal == 1) G = 1;
    else if (diffGoal == 2) G = 1.5;
    else G = (11 + diffGoal)/8;

    // W0
    const W0 = 1/(Math.pow(10, (-diffElo/400)) + 1);

    // W
    let W;
    if (goalA > goalB) W = 1;
    else if (goalA == goalB) W = 0.5;
    else W = 0;

    // P
    const P = parseInt(32 * G * (W - W0), 10);

    return [eloA + P, eloB - P, G, W, W0, P];
  } catch (error) {
    console.log(error);
    throw error;
  }
}

const calculateEloPointV2 = (data) => {
  const eloA = parseInt(data.eloA);
  const eloB = parseInt(data.eloB);
  const goalA = parseInt(data.goalA);
  const goalB = parseInt(data.goalB);
  try {
    const diffGoal = Math.abs(goalA - goalB);
    const diffElo = eloA - eloB;
    
    // // G
    // const G = 0;
    // if (diffGoal == 1) G = 1;
    // else if (diffGoal == 1.5) G = 2;
    // else G = (11 + diffGoal)/8 

    // W0
    const W0 = 1/(Math.pow(10, (-diffElo/400)) + 1)

    // W
    const W = goalA - goalB
    // P
    const PA = parseInt(32 * (W - W0)) 

    return [eloA + PA, eloB - PA]
  } catch (error) {
    console.log(error);
    throw error;
  }
}

const result = calculateEloPointV2({
  eloA: 200,
  eloB: 1000,
  goalA: 1,
  goalB: 0
})

console.log(result);