Array equivalents

dexeloper · Aug 18, 2009

Am I the only person who didn't know that if you say
arrA = arrB then changing an element in arrA also changes the equivalent element in arrB.
Try this page:

<html><head>
<script language = "JavaScript" type="text/javascript">
function xx() {
var arrB = [];
arrB[0] = "AAA";
var arrA = arrB;
alert(arrB[0]);
arrA[0] = "trtrtrtrtr";
alert(arrB[0]);
}
</script>
</head>
<body>
<input type='button' onclick='javascript:xx()'>
</body>
</html>

feherke · Aug 18, 2009

Hi

Yepp. That is basic.

The [tt]Array[/tt] is an object [sup](*)[/sup] and objects are passed by reference.

( If you want to clone an object, google for "javascript deep-copy". )

[sup](*)[/sup] I this context all those for which the [tt]typeof[/tt] operator returns "object".

Feherke.

http://rootshell.be/~feherke/

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Array equivalents

dexeloper

Programmer

feherke

Programmer

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