Empty string: Difference between revisions
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(→{{header|Perl 6}}: Added PureBasic) |
(Added PicoLisp) |
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say 'String is empty' unless $s.chars; |
say 'String is empty' unless $s.chars; |
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say 'String is not empty' if $s.chars;</lang> |
say 'String is not empty' if $s.chars;</lang> |
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=={{header|PicoLisp}}== |
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The empty string is represented by '[http://software-lab.de/doc/ref.html#nilSym NIL]' in PicoLisp. During input, two subsequent double qoutes '""' return the symbol NIL. |
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<lang PicoLisp># To assign a variable an empty string: |
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(off String) |
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(setq String "") |
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(setq String NIL) |
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# To check for an empty string: |
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(or String ..) |
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(ifn String ..) |
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(unless String ..) |
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# or a non-empty string: |
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(and String ..) |
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(if String ..) |
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(when String ..)</lang> |
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=={{header|PureBasic}}== |
=={{header|PureBasic}}== |
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In PureBasic we can just test a string for truth to determine if it has a value. |
In PureBasic we can just test a string for truth to determine if it has a value. |
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