findMaxNumber

const solution = (numbers) => {
    let maxNumber = 0;
  
    for (let i=0; i<numbers.length; i++){
        if (numbers.length < 1)
          return maxNumber;
        if (numbers[i] > maxNumber)
          maxNumber = numbers[i];
    }
    return maxNumber;
};

console.log(solution([1,2,3,4,5,6]));