r25445 - docs/Perl6/Spec/S32-setting-library

	Geoffrey Broadwell
	Feb 24, 2009 at 9:31 pm

On Tue, 2009-02-24 at 12:31 -0800, Jon Lang wrote:
$y ± 5 # same as ($y - 5) | ($y + 5)
$y within 5 # same as ($y - 5) .. ($y + 5)

Oh, that's just beautiful.

-'f

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TSa (Thomas Sandlaß): This is a pretty add-on to smartmatch but I still think we are wasting a valueable slot in the smartmatch table by making numeric $x ~~ $y simply mean $x == $y. What is the benefit? Regards, TSa. -- "The unavoidable price of reliability is simplicity" -- C.A.R. Hoare "Simplicity does not precede complexity, but follows it." -- A.J. Perlis 1 + 2 + 3 + 4 + ... = -1/12 -- Srinivasa Ramanujan

Follow ups

Jon Lang: (I'm assuming that you meant something like "if $y ~~ [..] $x ± $epsilon {...}", since matching a value to a range that's centered on that value is tautological.) Junctions should not return individual values in list context, since it's possible for one or more of said values to _be_ lists. That said, I believe that it _is_ possible to ask a Junction to return a set of its various values (note: set; not list). Still, we're already at a point where: if $y ~~ $x within $epsilon {...} uses the
Daniel Ruoso: It is not the junction that is returning the individual values, but the infix:<±> operator... daniel
Jon Lang: Larry's suggestion wasn't about ~~ vs. ==; it was about "within" as an infix operator vs. "within" as a method or an adverb. -- Jonathan "Dataweaver" Lang

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