JSFiddle - React, Tailwind, and code Playground

HTML

<button id='test'>Issue</button>

JavaScript

$('test').addEvent('click', ( function(){

    var test = [
      { 'count' : 1 , 'average' : 2 , 'total' : 3 } ,
      { 'count' : 10 , 'average' : 20 , 'total' : 30 } , 
      { 'count' : 100 , 'average' : 200 , 'total' : 300 }
    ] ; 

    console.log( test ) ; 
    
    test.forEach( function( element , service_index , array ){
      
          array[ service_index ].count = 1111111 ;
          array[ service_index ].average = 2222222 ;
          array[ service_index ].total = 3333333 ;

    });
    
    console.log( test ) ;
  
  }));