forin.js

const person = {
  name: 'Alex',
  age: 25,
  sayHi: function(){
    console.log(`Hi there, my name is ${this.name} and I am ${this.age} years old`)
  }
}

for (let key in person){
  console.log(`${key} => ${person[key]}`)
}

/*
name => Alex
age => 25
sayHi => function (){
    console.log(`Hi there, my name is ${this.name} and I am ${this.age} years old`)
  }
*/