JavaScript

NavigatorID.appName - Web APIs | MDN[^]:

This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
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Do not rely on this property to return the correct browser name. In most browsers (like Firefox, Chrome, Safari, Opera and Internet Explorer) the returned string is "Netscape".

1. JavaScript is not the same thing as Java.
2. That's not how it works. There are plenty of sites where you can pay someone to do your work for you. This is not one of them.

function sendMessage(name, delay) {
           console.log(name, delay);
       }

       var packetInfo = [{ name: 'Packet1', delay: 200 },
       { name: 'Packet2', delay: 600 },
       { name: 'Packet3', delay: 1800 },
       { name: 'Packet4', delay: 2400 },
       { name: 'Packet5', delay: 2600 }];

       var prev = undefined;
       for (var i = 0; i < packetInfo.length; i++) {
           var item = packetInfo[i];
           if (i == 0)
               sendMessage(item.name, item.delay);
           else {

               if( item.delay -  prev.delay > 500 )
                   sendMessage(item.name, item.delay);

           }
           prev = item;
       }

{ 
    "1" : 
     [
         {
              "field": "value"...

var str = "{ \"1\": [{\"field\": \"attr\"}]}";

var obj = JSON.parse(str);

// Access the object with key "1", then first element inside it, then the field. 
alert(obj["1"][0].field);