Struktur Data Queue

?html>
?head>
?title>Struktur Data Queue?/title>
?script language = "javascript">

var queue = new Array () ;

function Masuk_Antrian (data) {
queue.unshift (data) ;
}

function Keluar_Antrian () {
var yang_keluar_antrian = queue.shift () ;
if (queue.length == 0)
return "Queue Sudah Kosong" ;
else
return yang_keluar_antrian ;
}

function Dalam_Antrian (list) {
list.options.length = 0 ;
for (var i = 0; i ? queue.length; i++) {
var data = new Option (queue[i]) ;
list.options [list.options.length] = data ;
}
}

?/script>
?/head>
?body>
?form>
?input type = text name = textSimpan>
?input type = button value = "Masuk Antrian"
onClick = 'Masuk_Antrian (textSimpan.value) ;
textSimpan.value = "" ;
Dalam_Antrian (Visualisasi) ;'>

?select name = "Visualisasi" size = 12 >
?option> Isi Antrian ....
?/select>
?input type = text name = textAmbil size = 20>
?input type = button value = "Keluar Antrian"
onClick = "textAmbil.value = Keluar_Antrian () ;
Dalam_Antrian (Visualisasi) ;">

?/form>
?/body>
?/html>