Category:TXR: Difference between revisions
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→Good Hacker Borrow; Great Ones Steal
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Array and list slices are straight out of Python, right down to the half-open ranges (not including the upper endpoint), and negative values indexing from the tail of the array. The concept is further improved upon by allowing the Lisp symbols <code>nil</code> and <code>t</code> to be used as range indexes.
Slices, even empty ones, are assignable places in TXR Lisp: we can easily replace a possibly empty section of a string, lisp or vector, with a sequence that is of different length, also possibly empty: for instance, if <code>x</code> contains <code>"abc"</code> then <code>(set [x 1..2] "foo")</code> changes <code>x</code> to contain <code>"afooc"</code>.
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