Find the Student that Will Replace the Chalk LeetCode solution in JavaScript

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var chalkReplacer = function (chalk, k) {
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  const sum = chalk.reduce((r, c) => r + c, 0);
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  k %= sum;
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  for (let i = 0; i < chalk.length; i++) {
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    if (chalk[i] > k) {
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      return i;
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    }
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    k -= chalk[i];
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  }
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};