snake ladder
JavaScript
for (let i = 100; i > 0; i -= 10) {
const row = []
if ((i / 10) % 2) {
for (let j = i - 9; j <= i; j++) {
row.push(j)
}
} else {
for (let j = i; j > i - 10; j--) {
row.push(j)
}
}
console.log(row.join(' '))
}