enumeration1.js

const user = {
  firstName: 'Akash',
  showDetails: function () {
    return `I am ${this.firstName} `
  }
};

for (firstName in user) {
  console.log("Name: " + firstName) // Name: firstName,  Name: showDetails
  console.log("Value: " + user[firstName]) // Value: Akash,  Value: function () 
}