Key Iteration

There is a special for...in loop to iterate over all keys of an object.

const obj = {
  name: 'Ali',
  age: 65,
};

for (let key in obj) {
  console.log(key, obj[key]);
}
// name Ali
// age 65

To avoid subtle errors you should always assume the for...in loop visits the keys in an arbitrary order. Also, be aware that for...in includes inherited keys in its iteration.

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