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06.12.2008 at 09:48AM PDT, ID: 23480200
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9.0

Iterating over a 2D array

Asked by DJ_AM_Juicebox in Perl Programming Language

Hi,

When you're using the following syntax to iterate a 2D array:

    for ($it (@my2dArray)) {
   
        for ($j = 0; $j < @$it; $j++) {
        }
    }

I'm assuming that:

    for ($it (@my2dArray)

means create a reference to the array called $it, that points to the current row in the loop. Then you can access an element in the row being referenced like:

    $it->[$columnIndexYouWant];

This funky statement:

    $j < @$it

specifically the:

    @$it

I don't know how to explain - I know it is giving you the number of columns in the row referenced by $it. I know in a 1D array you can just do this:

     my @my1dArray = (0,1,2);
     for (my $i = 0; $i < @my1dArray; $i++)

and the

    < @my1dArray

will give you the size of the array. So in the 2d array though, you need the dollar sign since $it is a scalar which is a reference to the row, then you put the @ symbol in front of it to signal that you want it interpreted as the entire 1d array of the row, so perl gives you the size?


This is quite verbose compared to C!

Thanks
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[+][-]06.12.2008 at 10:49AM PDT, ID: 21771928

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About this solution

Zone: Perl Programming Language
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Solution Provided By: ozo
Participating Experts: 4
Solution Grade: A
 
 
[+][-]06.12.2008 at 08:15PM PDT, ID: 21775648

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