[Haskell-cafe] Re: let and fixed point operator
peter at syncad.com
Thu Aug 30 12:37:18 EDT 2007
1 f x =
2 let x = x * scale in
3 g x
Hmmm ... just assume that the scope of the x on line 3 (which
hides the x from the higher level scope is extended from line 3 to
the beginning part of line 2 (from line start to the equal sign).
OCAML does it. "Let before" in Clean does it too. Does not sound
bad to me either. So this sounds to me like weak argument compared
to disadvantages. There should be something else (I'm missing)
Dan Piponi wrote:
> On 8/30/07, Peter Hercek <peter at syncad.com> wrote:
>> f x =
>> let x = x * scale in
>> let x = x + transform in
>> g x
> Why are you trying to call three different things by the same name 'x'
> in one tiny block of code? That's very confusing and makes it hard to
> reason equationally about the code.
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