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Getting property names
Get an array of an object's keys:
let user = { name: "Alice", age: 30, city: "Seattle" }
let keys = Object.keys(user)
console.log(keys) // ["name", "age", "city"]
Useful for iterating or checking how many properties exist:
if (Object.keys(user).length === 0) {
console.log("Object is empty")
}