To find array index of complex

<aura:component >
   
     <aura:handler name="render" value="{!this}" action="{!c.myAction}"/>
   
<aura:attribute name="objs" type="Object[]" />
</aura:component>




({
myAction : function(component, event, helper) {
var studentsArray =
     [
    {
    "rollnumber": 1,
    "name": "dj",
    "subject": "physics"
   },
   {
   "rollnumber": 2,
  "name": "tanmay",
  "subject": "biology"
   },
  {
   "rollnumber": 3,
   "name": "amit",
   "subject": "chemistry"
   },
       
       
  ];
           console.log('studentsArray'+JSON.stringify(studentsArray[0]));
        console.log(studentsArray[0].rollnumber);
  console.log(studentsArray[0].name);
        console.log(studentsArray[0].subject);

        for(var i=0;i<studentsArray.length;i++){
            if(studentsArray[i].name === 'amit')
    {
        console.log(i);
    }
        }

},
   

})


o/p

studentsArray{"rollnumber":1,"name":"dj","subject":"physics"}
findArrayElement.js:32 1
findArrayElement.js:33 dj
findArrayElement.js:34 physics
findArrayElement.js:39 2