//https://code.jquery.com/jquery-3.5.0.js

​

var scores = '{ "first": { "score": 660 }, "second": { "score": 330 } }';

​

var objkeys = $.parseJSON(scores);  

$.each(objkeys, function(key, value) {

    $.each(value, function(key, value){

        console.log(value);                        

    });

});

var someObj = { foo: "bar"};

​

$.each(someObj, function(propName, propVal) {

  console.log(propName, propVal);

});

​

$.map(mapArray, function(val, key) {

  alert("Value is :" + val);

  alert("key is :" + key);

});