keyof and typeof Operators
The keyof type operator works with object types to create a string or numeric literal union of its keys.
The typeof type operator queries the type of a value, allowing you to refer to it in various places.
let person = {name: "Alice", age: 28};
type Person = typeof person;
type PersonKeys = keyof Person; // "name" | "age"
Exercise
Create a function that updates a property's value in an object, given the object, a property key, and a new value.
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