Destination City LeetCode solution in JavaScript

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/*
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 * @param {string[][]} paths
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 * @return {string}
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 */
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var destCity = function (paths) {
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  let map = {};
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  for (let city of paths) {
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    map[city[0]] = map[city[0]] ? map[city[0]] + 1 : 1;
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  }
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  for (let city of paths) {
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    if (!map[city[1]]) return city[1];
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  }
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};