JSFiddle - React, Tailwind, and code Playground

HTML

<div id="months">unchanged</div>

JavaScript

var getMonth = function (num) {
    var m = {
        1: 'Jan', 2: 'Feb', 3: 'Mar',
        4: 'Apr', 5: 'May', 6: 'Jun',
        7: 'Jul', 8: 'Aug', 9: 'Sep',
        10: 'Oct', 11: 'Nov', 12: 'Dec'
    }
    return m[num];
}

$('#months').text(getMonth(8));