Can anyone explain this code?

Question

JavaScript
https://code.sololearn.com/Wd7zSd4VQ932/?ref=app

Answer 1

The variables in objects with : sign are local of that object. But when we use =, then it acts on global x,y and z variables.
So for x we have: 4, for y which is reassigned in second object we have: 2, and for z which is replaced with value of z from xyz object in the third line we have: 0.
So the string representation will be: 420.

Answer 2

It is trying to show a picture, but since there is no link, it doesn´t show up.

Replace line number 7 with:

<img src = "https://www.google.com.ar/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png">

Answer 3

It swaps the values of the variables x, y and z in order to make them become x=4, y=2, z=0;

Google 420 weed and you will understand it.

Answer 4

Fernando Pozzetti i want explaination of JavaScript part