let numbers = [4, 5, 3, 1, 2];

for (var i = 0; i < numbers.length - 1; i++) {
    console.log(`i = ${i}; numbers = ${numbers}`)
    for (var j = i; j < numbers.length; j++) {
        console.log(`j = ${j}`);
        console.log(`Is ${numbers[i]} > ${numbers[j]}?`);
        if(numbers[i] > numbers[j]) {
            console.log(`Yes. numbers[${j + 1}] is now ${numbers[j]}`);
            // swap numbers[j] with numbers[i]
            let tmp = numbers[j];
            numbers[j] = numbers[i];
            numbers[i] = tmp;
        } else {
            console.log('no');
        }
        console.log(`numbers = ${numbers}`)
    }
}