Re: [Haskell-cafe] Language complexity & beginners

I think that's the reason why Python doesn't have multi-line lambdas: Guido believed they aren't readable enough without giving them names. It's wrong for exactly the same reasons.

On 09 Feb 2016, at 19:11, Joachim Durchholz wrote:

Am 09.02.2016 um 18:24 schrieb Kosyrev Serge:

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foo (thInt (fromIntegral (c2hsValueInt cexp))) (thInt (fromIntegral (c2hsValueInt cexp)))

I clearly made a mistake of duplicating a real expression.. should have picked two different expressions for an example.

The counterexamples still work.

This:

foo (thInt1 (fromIntegral1 (c2hsValueInt1 cexp1))) (thInt2 (fromIntegral2 (c2hsValueInt2 cexp2)))

can still become this:

let int1 = thInt1 (fromIntegral1 (c2hsValueInt1 cexp1)) int2 = thInt2 (fromIntegral2 (c2hsValueInt2 cexp2)) in foo int1 int2

and that's perfectly readable in my book.

If you don't like the nested parentheses, use function composition:

let fn1 = thInt1 . fromIntegral1 . c2hsValueInt1 fn2 = thInt2 . fromIntegral2 . c2hsValueInt2 in foo (fn1 int1) (fn2 int2)

Function composition isn't the main tool though; I found that naming subexpressions always works, plus the names can help with readability if they are chosen wisely. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe