Question $3$

Consider the following JavaScript program with static $-$ scoping:

var x$=1,$ y$=2$;

function sub$1)\{$

var a$=3,$ z$=4$;

var m$=$y;

function sub$20\{$

var a$=5,$y$=6$;

p$=$x;

~$.\backslash$

$\}$

~$.\backslash$

$\}$

function sub$3()\{$

var a$=7,$ w$=8$;

var q$=$y;

$\}$

Answer the questions:

What is the value of $z$ in sub$10?$

What is the value of $y$ in sub$10?$

What is the value of a in sub$20?$

What is the value of $x$ in sub$20?$

What is the value of a in sub$30?$

What is the value of $y$ in sub$30?$