object keys to strings

 dot operator(.) doesnot consider 1 as a string


let obj = {
  1: "a",
  2: "b",
  undefined: "c",
  true: "d",
  null: "e",
};
console.log(obj["1"]);
console.log(obj["2"]);
console.log(obj["true"]);
console.log(obj["null"]);
console.log(obj["undefined"]);
console.log(obj.true);
console.log(obj.undefined);
console.log(obj.null);


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