alert doesn't work, why?

Question

JavaScript

Hello. I'm learning JS. The question is, why doesn't the alert work? Even if an arbitrary message is written, the script does not reach alert, something is wrong in the array.

var lang = 'ru';
var day = 1;
var arr = {'ru': [1:'Пн', 2:'Вт', 3:'Ср', 4:'Чт', 5:'Пт', 6:'Сб', 7:'Вс'],
    'en': [1:'Mon', 2:'Tues', 3:'Wedn', 4:'Thur', 5: 'Fri', 6:'Sutur', 7:'Sun']
    };
alert(arr[lang]);

Answer 1

In arrays, remove indices Either the object

let obj = {
   'ru': {1:'Пн', 2:'Вт', 3:'Ср', 4:'Чт', 5:'Пт', 6:'Сб', 7:'Вс'},
   'en': {1:'Mon', 2:'Tues', 3:'Wedn', 4:'Thur', 5: 'Fri', 6:'Sutur', 7:'Sun'}
}
console.log(obj["en"][1])