how to iterate over each keys in object javascript code example

Example 1: javascript loop through object example

var person={
 	first_name:"johnny",
  	last_name: "johnson",
	phone:"703-3424-1111"
};
for (var property in person) {
  	console.log(property,":",person[property]);
}

Example 2: loop key in object

const fruits = { apple: 28, orange: 17 }

for(key in fruits){
	console.log(key)
}