Here the logic runs JS?

All good, here is the code and a couple of questions on it.
Who would not find difficult to answer, thank you!)

var team = { 13: 'Mickle', 10: 'Joe', 11: 'Stacy' } var player = 10; var question = team[player]; console.log(question);

actually a question: whether correctly I understand how JS works here. When we pointed out 'player' in brackets we are told JS that now it is necessary to look up the value in object with a similar value (10)?
Or is the logic slightly different? Please answer as accessible language)