HackerRank: Birthday Chocolate (easy)

Link to code challenge
function birthday(s, d, m) { let count = 0; let pointer = 0; while (pointer <= s.length - m) { let sum = 0; let length = 0; for (let i = pointer; length < m; i++) { sum += s[i]; length++; } if (sum === d) count++; pointer++; } return count; }

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