javascript prevent object mutationpassed

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1let obj = {
2  name:"FreeCodeCamp"
3  review:"Awesome"
4};
5Object.freeze(obj);
6obj.review = "bad"; //will be ignored. Mutation not allowed
7obj.newProp = "Test"; // will be ignored. Mutation not allowed
8console.log(obj); 
9// { name: "FreeCodeCamp", review:"Awesome"}

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