JSFiddle - React, Tailwind, and code Playground

by web-nfo.com

JavaScript

var events = [{day:15},{day:20},{day:25}];
var eventDays = [];
var myEvents = [];

for (var i=0; i<events.length; i++) {
    eventDays.push(events[i].day);
}

for (var day=1; day<=31; day++) {
    if (eventDays.indexOf(day) != -1) {
        myEvents.push('<li>' + day + '</li>');
    }
}

for (var i=0; i<myEvents.length; i++) {
    console.log( myEvents[i] );
}