User defined pipe and redirection operators: Difference between revisions
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As for the concept of a pipe that presents data one record at a time to a downstream function, that corresponds to the J operator <code>@</code> but it's not clear how to demonstrate that usefully, in this task. (And, I could write pages of code, to accomplish what's being accomplished here with the two successive greps, but I find that concept distasteful and tedious.) |
As for the concept of a pipe that presents data one record at a time to a downstream function, that corresponds to the J operator <code>@</code> but it's not clear how to demonstrate that usefully, in this task. (And, I could write pages of code, to accomplish what's being accomplished here with the two successive greps, but I find that concept distasteful and tedious.) |
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That said, note also that J's sort (<code>/:~</code>) and uniq (<code>~.</code>) operations would work just fine on this kind of data. |
That said, note also that J's sort (<code>/:~</code>) and uniq (<code>~.</code>) operations would work just fine on this kind of data. For example: |
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<lang j> ;'aa' grep 'ALGOL' grep data,data |
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* Adriaan van Wijngaarden - Dutch pioneer; ARRA, ALGOL |
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* Adriaan van Wijngaarden - Dutch pioneer; ARRA, ALGOL |
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;~.'aa' grep 'ALGOL' grep data,data |
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* Adriaan van Wijngaarden - Dutch pioneer; ARRA, ALGOL |
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</lang> |
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=={{header|Perl}}== |
=={{header|Perl}}== |
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