'use strict';

$//$ membership.js

$//$ This script calculates the cost of a membership.

$//$ Function called when the form is submitted.

$//$ Function performs the calculation and returns false.

function calculate$()\{$

$//$ TODO declare a variable named 'cost' to store the total cost:

$//$ TODO lookup the type and years input elements with DOM getElementById$()$

$//$ TODO Convert the year to a number $($see parseInt$())$

if $($years && years.value$)\{$

years $=$ parseInt$($years$.$value, $10)$;

$\}$

$//$ Check for valid data:

if $($type && type.value && years && $($years $>0))\{$

$//$ TODO Add a switch statement to determine the base cost using the value of "type"

switch $($type$.$value$)\{$

case 'basic':

break;

case 'premium':

break;

case 'gold':

break;

case 'platinum':

break;

$\}$

$//$ TODO Update cost by multiplying number of years

$//$ Discount multiple years

if $($years $>1)\{$

cost $*=\mathrm{.}80$; $//80\%$

$\}$

let costElement $=$ document.getElementById$(\text{'}$cost$\text{'})$;

$//$ TODO convert cost to a number and then format to decimal places $($see Number.toFixed$())$

$//$ TODO update the value property of 'costElement' to the calculated cost

$\}$

$//$ Return false to prevent submission:

return false;

$\}$

function init$()\{$

document.getElementById$(\text{'}$theForm$\text{'}).$onsubmit $=$ calculate;

$\}$

window.onload $=$ init;

$"$