Counter-Strike JS Fundamentals

function counterStrike(arr) {
    let initialEnergy = Number(arr[0]);
    let index = 1;
    let command = arr[index];
    index++;
    let battlesWon = 0;
    let hasEnoughEnergy = true;

    while (command !== "End of battle") {
        let distance = Number(command);

        if (initialEnergy - distance < 0) {
            hasEnoughEnergy = false;
            break;
        }

        initialEnergy -= distance;
        battlesWon++;

        if (battlesWon % 3 === 0) {
            initialEnergy += battlesWon;
        }
        command = arr[index];
        index++;
    }

    if (hasEnoughEnergy) {
        console.log(`Won battles: ${battlesWon}. Energy left: ${initialEnergy}`);
    } else {
        console.log(`Not enough energy! Game ends with ${battlesWon} won battles and ${initialEnergy} energy`);
    }
}