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Rock, Paper, Scissors
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>Rock, Paper, Scissors</title> | |
</head> | |
<body> | |
<select id="user-choice"> | |
<option value="0">Rock</option> | |
<option value="1">Paper</option> | |
<option value="2">Scissors</option> | |
</select> | |
<button id="action-perform-move">Start</button> | |
<strong id="result"></strong> | |
<script type="text/javascript"> | |
(function() { | |
var print = function(str) { el('result').innerText = str; }, | |
el = function(id) { return document.getElementById(id); }, | |
performMove = function(user) { | |
var computer = Math.floor(Math.random() * 3); | |
if(user === computer) throw 'Tie'; | |
return computer === (user + 2) % 3; | |
}; | |
el('action-perform-move').addEventListener('click', function() { | |
var sel = el('user-choice'); | |
var user = parseInt(sel.options[sel.selectedIndex].value); | |
try { | |
var res = performMove(user); | |
if(res) print('You win.'); | |
else print('You loose.'); | |
} catch(e) { print('The result is a tie.'); } | |
}); | |
})(); | |
</script> | |
</body> | |
</html> |
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