JSFiddle - React, Tailwind, and code Playground

by saidulu401

JavaScript

var id_first=[]
var data =  [{
    "id_first": "1",
    "data_first": "1"   }, {
    "id_first": "2",
    "data_first": "2"  },  {
    "id_second": "1",
    "data_second": "1"  }, {
    "id_second": "2",
    "data_second": "2"  }]
     for(var i in data) {
     if(data[i].id_first != undefined){
          id_first.push(data[i].id_first);
          alert(data[i].id_first);
          }
     }