HackerRank: Counting Valleys (Easy)

Link to code challenge
function countingValleys(n, s) { let level = [0]; let count = 0; for (let step of s) { if (step === "U") { level.push(level[level.length - 1] + 1); if (level[level.length - 2] < 0 && level[level.length - 1] === 0) count++; } else if (step === "D") { level.push(level[level.length - 1] - 1); if (level[level.length - 2] < 0 && level[level.length - 1] === 0) count++; } } return count; }

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