Array duplication?

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davepla - 29 Apr 2005 22:21 GMT

Hi:

how can I duplicate an existing array? If I do:

bufferTmp = buffer;

being buffer an array, bufferTmp contains a reference to the same array not a copy

TIA,

David P.

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Boonana - 29 Apr 2005 22:51 GMT

did you try:

bufferTmp = new Array();
bufferTmp = buffer;

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davepla - 29 Apr 2005 23:00 GMT

Yes, I tried declaring bufferTmp as an array but it keeps referencing buffer array

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Jeckyl - 30 Apr 2005 02:42 GMT

What the does is create a new array, and assign a reference to it to
bufferTmp

Then it removes the reference to the new array (making it disappear) and
replaces it with a reference to bufferTmp .. do bufferTmp and buffer both
refer to the same array.

Signature

Jeckyl

> did you try:
>
> bufferTmp = new Array();
> bufferTmp = buffer;

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Rothrock - 29 Apr 2005 23:59 GMT

Yup that is how it works in Flash. What you want to do is create a new blank
array and then step through and duplicate each element in the array.

//some arrray that already exists called myFirstArray
mySecondArray=new Array();
for(i in myFirstArray){
mySecondArray=myFirstArray;
}

At least I think it something like that. I didn't actually test it. Let me
know if that doesn't work for you.

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NSurveyor - 30 Apr 2005 00:24 GMT

You cannot duplicate an array using bufferTmp = buffer; Bot bufferTmp and
buffer will still reference (point) to the exact same array. Strings and
Numbers can be duplicated in this way but I believe all the rest will just
"point" as they are not primitive. I would just use concat to duplicate it.
Something like:

bufferTmp = new Array();
bufferTmp = bufferTmp.concat(buffer);

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kglad - 30 Apr 2005 01:43 GMT

or

buffertemp=buffer.concat();

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davepla - 30 Apr 2005 15:12 GMT

Yes, you're right. It's the way many languages treat objects when you assign
them to a var/object, creating a reference to it instead a copy. I was looking
for something like duplicate function in Lingo:

bufferTmp = buffer.duplicate()

Finally I found that's what slice method do if you don't pass any parameter:

bufferTmp = buffer.slice()

Thanks to everybody for your help,

David P.

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Webmaster Forum / Flash / Flash Actionscript / April 2005

Array duplication?