Evaluate the Bracket Pairs of a String LeetCode solution in JavaScript

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var evaluate = function (s, knowledge) {
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  // key => value hash map can be directly constructed using the Map constructor
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  const map = new Map(knowledge);
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  // since bracket pairs can't be nested we can use a RegExp to capture keys and replace using a map constructed in the line above
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  return s.replace(/\(([a-z]+)\)/g, (_, p1) => map.get(p1) ?? "?");
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};