surprised when I copy an array ...

Just wondering if anybody else finds this surprising:

Code:

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var master:Array = [5,6,7,8,9];
var copy:Array = master;

trace(copy); // 5,6,7,8,9
trace(master); // 5,6,7,8,9
copy[2] = 1001;
trace(copy);  // 5,6,1001,8,9
trace(master);  // 5,6,1001,8,9 (original also changed)

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So I need to do things this way, and then everything works fine:

Code:

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var master:Array = [5,6,7,8,9];
var copy:Array = [master[0],master[1],master[2],master[3],master[4]];
trace(copy); // 5,6,7,8,9

copy[2] = 1001;
trace(copy);  // 5,6,1001,8,9
trace(master);  // 5,6,7,8,9  (original untouched)

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So arrays behave very differently from 'normal' variables:

Code:

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var master:int = 56;
var copy:int = master;

copy = 1001;
trace(copy); // 1001
trace(master); // 56

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Is this a 'Flash' thing, or do most programming languages work in this way?
Just wondering, that's all.

to copy an array use the Array.concat method.
the original array is left unchanged.

PHP Code:

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var master:Array = [5,6,7,8,9];
var copy:Array = [];

copy = master.concat();

copy[2] = 1001;
trace(copy);
trace(master); 


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Thank You, a_modified_dog.

That's useful.