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    0: #Want to sort a complex data structure by some element
    1: #efficiently?  For example, how do you sort an array
    2: #of strings by their length?  Use the transform:
    3:    @sorted = map { $_->[1] }
    4:    sort { $a->[0] <=> $b->[0] }
    5:    map { [ length $_, $_ ] } @strings;
    6: 
    7: #Confused?  Put in temporary arrays, 
    8: #just to see what we're doing.
    9: 
    10: # create a temporary array of anonymous arrays
    11: # (0: length of the string, 1: the string)
    12:    @temp = map { [ length $_, $_ ] } @strings;
    13: # sort by length
    14:    @temp = sort { $a->[0] <=> $b->[0] };
    15: # grab just the strings and put them in @ordered
    16:    @sorted = map { $_->[1] } @temp;
    17: 
    18: #Knowing the context of certain operations
    19: # and being able to chain them together
    20: # is crucial to a deep and idiomatic
    21: # understanding of Perl.

In reply to Schwartzian Transform by chromatic

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