in reply to Problem with traversing a two dimensional array

split returns a list, to make an array you need [ 'square' , 'brackets' ]

for exampe  push @sandGrid, [ split '', $line ];

Say it with me:

{ 'hashes', 'are', 'curly', 'ones' }

[ 'arrays', 'are', 'square' ]

( 'lists are round' )

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Re^2: Problem with traversing a two dimensional array (to create an arrayref use [ ] )
by Laurent_R (Canon) on Jan 16, 2014 at 07:15 UTC
    Hmm, the solution is correct but, in my view, the explanation seems to miss the main point: the main point is that, to construct an AoA, what needs to be pushed onto the larger array is not a list nor an array, but an array reference, and the sqare bruckets acts in this case as an array reference constructor.
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      Hmm, the solution is correct but, in my view, the explanation seems to miss the main point:

      I don't think so Laurent_R, that is impossible
      The error message says Can't use string(".") as an ARRAY ref
      My answer title says (to create an arrayref use [ ] )
      My answer says split returns a list, to make an array you need [ 'square' , 'brackets' ]

      your view is tiny

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        split returns a list, to make an array you need 'square' , 'brackets'

        Well, this: 

        (split /$separator/, $line)

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        gives you an array, on which you can use an index to find one element, for example: 
        my $third_elmnt = (split /$separator/, $line)[2];

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        On the other hand, this: 
        [split /$separator/, $line];

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        does not give you an array, but an arrayref i.e. a single scalar. And an arrayref is what you need to oush onto an array if you want to build an AoA.

        You probably know all that, I was only objecting to the fact that this was not made very clear in my humble opinion.

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