1Object.entries(obj).forEach(
2    ([key, value]) => console.log(key, value)
3);

1Object.keys(obj).forEach(function(key) {
2  console.log(key, obj[key]);
3});

1var obj = { first: "John", last: "Doe" };
2
3Object.keys(obj).forEach(function(key) {
4    console.log(key, obj[key]);
5});

1for (var property in object) {
2  if (object.hasOwnProperty(property)) {
3    // Do things here
4  }
5}
6

1var person={
2 	first_name:"johnny",
3  	last_name: "johnson",
4	phone:"703-3424-1111"
5};
6for (var property in person) {
7  	console.log(property,":",person[property]);
8}

1const fruits = { apple: 28, orange: 17 }
2
3for(key in fruits){
4	console.log(key)
5}