The code defines a function called staircase that takes an integer argument n. The code prints out a staircase pattern on the console. The pattern repeats n-i times, and the last number in the pattern is the total number of repeats.
function staircase(n) {
for (let i = 1; i <= n; i++) {
console.log(" ".repeat(n-i) + "#".repeat(i))
}
}