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Re^2: undefined elements in array

by Anonymous Monk
on Aug 20, 2013 at 13:35 UTC ( #1050183=note: print w/ replies, xml ) Need Help??


in reply to Re: undefined elements in array
in thread undefined elements in array

mapping function can quite nice for this type of thing..

e.g. @a = (1,2,3,undef,5); print $#a; @b = map(defined, @a); print join(',',@b);


Comment on Re^2: undefined elements in array
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Re^3: undefined elements in array
by Athanasius (Abbot) on Aug 20, 2013 at 14:17 UTC

    I think you meant grep, not map:

    0:14 >perl -wE "@a = (1,2,3,undef,5); say scalar @a; @b = map(defined +, @a); print join(',', @b);" 5 1,1,1,,1 0:14 >perl -wE "@a = (1,2,3,undef,5); say scalar @a; @b = grep(define +d, @a); print join(',', @b);" 5 1,2,3,5 0:14 >

    Hope that helps,

    Athanasius <°(((><contra mundum Iustus alius egestas vitae, eros Piratica,

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