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September 23, 2016 03:05
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Haskell Symposium Lightning Talk
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| GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help | |
| Prelude> 1 + 2 | |
| 3 | |
| Prelude> minimum(100,1) | |
| 1 | |
| Prelude> minimum(1,100) | |
| 100 | |
| Prelude> let splat = splitAt 5 [0..10] | |
| Prelude> splat | |
| ([0,1,2,3,4],[5,6,7,8,9,10]) | |
| Prelude> concat splat | |
| [5,6,7,8,9,10] | |
| Prelude> fmap (+1) [1,2] | |
| [2,3] | |
| Prelude> fmap (+1) (1,2) | |
| (1,3) | |
| Prelude> let xs = [(1,"hello"),(2,"world")] | |
| Prelude> length "world" | |
| 5 | |
| Prelude> length (lookup 2 xs) | |
| 1 | |
| Prelude> let y = lookup 100 xs | |
| Prelude> null y | |
| True | |
| Prelude> length y | |
| 0 | |
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That's hilarious. we need more tools to print types. in excel, doing Alt + ~ (?) would show formulas and not numbers. We need an Alt + ~ which adds all the types, and can remove them as well when not needed.
Types are code.