How do I access properties of a javascript object if I don't know the names?

Question

Say you have a javascript object like this:

var data = { foo: \'bar\', baz: \'quux\' };

You can access the properties by the property name:

Answer 1

var obj = {
 a: [1, 3, 4],
 b: 2,
 c: ['hi', 'there']
 }
for(let r in obj){  //for in loop iterates all properties in an object
 console.log(r) ;  //print all properties in sequence
 console.log(obj[r]);//print all properties values
}