Comments (8)
As for <<
, the main problem I have there is that I've been seriously considering adding a number of combinators for using applicative modification.
<*>~
, etc. This means that you'd have <<*~
with a different semantics being consistently used.
The main reason I haven't actually done this already is that of course, you'd want *>~
and this means that there are two contenders for <*>~
. ;)
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@orenbenkiki had a fair bit to say in a further reply on #36.
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More traffic over on #36.
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Moving the < to the far right hand side of the operator (past the ~ or =) might lead to consistent semiotics that doesn't collide.
fresh = id +=< 1
But the result is a pretty ugly operator.
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We could just supply a single <<%~
operator.
Then the user could use _2 <<%~ (+1)
and we could avoid any confusion with other operators that start with <
.
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This would certainly be less intrusive than going over each and every <op~ and <op= operator (there is quite a list of these). It seems like a reasonable compromise...
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There are 4 commented-out test cases in hunit.hs demonstrating these operators that need to be re-enabled. You may use the opportunity to eliminate the comment about the uncovered use cases, given it is "decided" not to do the monadic modification operators.
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Good catch. Re-enabling
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