Hackerrank: The Birthday Bar Solution
1function birthday(s, d, m) {2 let res = 03 const sum = arr => arr.reduce((acc, el) => acc + el, 0)4 for (let i = 0; i < s.length - m + 1; i++) {5 if (sum(s.slice(i, i + m)) === d) {6 res++7 }8 }9 return res10}
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