JSFiddle - React, Tailwind, and code Playground

JavaScript

var obj = [
    {day:"monday", status:"present" , reason:""},
    {day:"tuesday", status:"present" , reason:""},
    {day:"wednesday", status:"absence" , reason:"sick"},

  ]
  var tdays=0;
  var pr=0;
  var ab=0;
  tdays=obj.length;
  for(var i=0;i<obj.length;i++)
  {
  if(obj[i].status=='present')
  	pr++;
    
   if(obj[i].status=='absence')
   ab++;
  }
  
  document.write('Total days:'+tdays)
 document.write('Present: '+pr)
  document.write('Absence:'+ab)