Modify the code in the library.js file so it contains a class named Calculator. This class should

have a constructor which defines properties for both input values.

The class should also have $4$ methods, $1$ for each of the math operations. If both values are valid

then each function should return the result of the calculation. If the results are not valid, it

should throw an exception.

Modify the claculate.js file to create and use an object from the Calculator class. Then use the

object to perform the calculations when each of the $4$ buttons are pressed.

Note that you should still validate the user entries to prevent an exception from being thrown.

Library.js:

"use strict";

calculate.js:

"use strict";

$$($document$).$ready$(()=>\{$

$$("$#addition"$).$click$(()=>\{$

let value$1=$ parseInt$($$$("$#value$1").$val$())$;

let value$2=$ parseInt$($$$("$#value$2").$val$())$;

if $($isNaN$($value$1)||$ isNaN$($value$2))\{$

alert$("$Please make sure both values are valid integers"$)$;

$\}$ else $\{$

$$("$#result"$).$val$($value$1+$ value$2)$;

$\}$

$\})$;

$$("$#subtraction"$).$click$(()=>\{$

let value$1=$ parseInt$($$$("$#value$1").$val$())$;

let value$2=$ parseInt$($$$("$#value$2").$val$())$;

if $($isNaN$($value$1)||$ isNaN$($value$2))\{$

alert$("$Please make sure both values are valid integers"$)$;

$\}$ else $\{$

$$("$#result"$).$val$($value$1-$ value$2)$;

$\}$

$\})$

$$("$#division"$).$click$(()=>\{$

let value$1=$ parseInt$($$$("$#value$1").$val$())$;

let value$2=$ parseInt$($$$("$#value$2").$val$())$;

if $($isNaN$($value$1)||$ isNaN$($value$2))\{$

alert$("$Please make sure both values are valid integers"$)$;

$\}$ else $\{$

$$("$#result"$).$val$($value$1/$ value$2)$;

$\}$

$\})$

$$("$#multiplication"$).$click$(()=>\{$

let value$1=$ parseInt$($$$("$#value$1").$val$())$;

let value$2=$ parseInt$($$$("$#value$2").$val$())$;

if $($isNaN$($value$1)||$ isNaN$($value$2))\{$

alert$("$Please make sure both values are valid integers"$)$;

$\}$ else $\{$

$$("$#result"$).$val$($value$1*$ value$2)$;

$\}$

$\})$

$$("$#cents"$).$focus$()$;

$\})$;

index.html: