I need help for this javascript question.. Plzzz

Question

Find the output of the following JavaScript code snippets.
i. var str = "Please locate 'locate' occurs!";
var pos = str.lastIndexOf("locate");
ii. var str = "Please locate 'locate' occurs!";
var pos = str.search("locate");
iii. var str = "Apple, Banana";
var res = str.substr(-4);
iv. var fruits = ["Banana", "Orange", "Apple"];
document.getElementById("demo").innerHTML = fruits.join(",");

Answer 1

Do yourself in javascript playground

Answer 2

So what's the problem?

Answer 3

Show what exactly you tried, since all the examples given work.
You wrote in html: <div id="demo"></div>?

Answer 4

Says, Find the output.. I tried them in the editor but showed no output whatsoever & Error.. I am new at this but i dont know what's wrong..