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Postings from August 2012
On Thursday August 30 2012 10:15:34 AM Johan Vromans wrote: > Case (switch, select, ...) statements have always been intended to serve > two purposes: the programmer and the compiler. To the programmer it > provides a quick and hopefully elegant way to test something against > several constant values. Constant is important for the second purpose, > since it can be compiled into a very efficient branch table. Disagreed. The shell's case statement does not require constant values and is hugely beneficial because of it. To the programmer, yes: quick and hopefully elegant way to test against several values. If this doesn't quite allow an efficient branch table, that's unfortunate, but we already use hash-based dispatch tables for that. And that already has to be constant values due to the nature of hashes. And I do have code already that checks: do I have a scalar, an array ref, or a code ref, and basically smart-matches against them (code running in perl 5.8.8). I was looking forward to using ~~ here to not only simplify the code, but allow more match styles, effectively reducing the number of times we may need to supply a code ref as those are relatively bulky.Thread Previous | Thread Next