Minimum Index Sum of Two Lists LeetCode solution in JavaScript

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var findRestaurant = function (list1, list2) {
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  let obj = {};
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  for (let i = 0; i < list1.length; i++) {
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    if (list2.indexOf(list1[i]) !== -1) {
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      const sum = i + list2.indexOf(list1[i]);
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      if (obj[sum] !== undefined) {
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        obj[sum]["value"].push(list1[i]);
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      } else {
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        obj[sum] = {};
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        obj[sum]["sum"] = sum;
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        obj[sum]["value"] = [];
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        obj[sum]["value"].push(list1[i]);
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      }
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    }
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  }
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  return Object.values(obj)[0]["value"];
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};