Add remaining haskell book exercises

Haskell-book/28/Bench/.gitignore

@@ -0,0 +1,3 @@
+.stack-work/
+Bench.cabal
+*~

Haskell-book/28/Bench/Setup.hs

@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain

Haskell-book/28/Bench/app/Main.hs

@@ -0,0 +1,46 @@
+module Main where
+
+import Criterion.Main
+import qualified Data.Map as M
+import qualified Data.Set as S
+import qualified Data.Vector as V
+import qualified Data.Vector.Unboxed as U
+
+genList :: Int -> [(String, Int)]
+genList n = go n []
+    where go 0 xs = ("0", 0) : xs
+          go n' xs = go (n' - 1) ((show n', n') : xs)
+
+pairList :: [(String, Int)]
+pairList = genList 9001
+
+testMap :: M.Map String Int
+testMap = M.fromList pairList
+
+testSet :: S.Set String
+testSet = S.fromList $ fmap fst pairList
+
+slice :: Int -> Int -> [a] -> [a]
+slice from len xs = take len (drop from xs)
+
+boxed :: V.Vector Int
+boxed = V.fromList [1..1000]
+
+unboxed :: U.Vector Int
+unboxed = U.fromList [1..1000]
+
+main :: IO ()
+main = defaultMain
+    [ bench "slicing unboxed vector" $
+        whnf (U.head . U.slice 100 900) unboxed
+    , bench "slicing boxed vector" $
+        whnf (V.head . V.slice 100 900) boxed
+    , bench "lookup one thing, set" $
+        whnf (S.member "doesntExist") testSet
+    , bench "insert one thing, set" $
+        whnf (S.insert "doesntExist" ) S.empty
+    , bench "lookup one thing, map" $
+        whnf (M.lookup "doesntExist") testMap
+    , bench "insert one thing, map" $
+        whnf (M.insert ("doesntExist", 0)) M.empty
+    ]

Haskell-book/28/Bench/package.yaml

@@ -0,0 +1,21 @@
+name:                Bench
+version:             0.1.0.0
+license:             BSD3
+author:              "Eugen Wissner"
+maintainer:          "belka@caraus.de"
+copyright:           "2018 Eugen Wissner"
+
+dependencies:
+- base >= 4.7 && < 5
+- containers
+- criterion
+- vector
+
+executables:
+  bench:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N

Haskell-book/28/Bench/stack.yaml

@@ -0,0 +1,65 @@
+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-11.9
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.7"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor