Ways to access property values in a for...in statement

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let user = {
  name: "John",
};

alert(user.name); //John

for (let key in user) alert(user.key); // undefined. 

for(let key in user) alert(user[key]); //John

Outside the for..in loop using user.name is equal to "John". When i use this same notation in the for...in loop as user.key, wouldn't the key be replaced by name and become user.name and the alert would output "John".

However,this is not the case and the result is undefined instead of John. Can someone explain why this is not working?

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Posted: 3 years ago
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