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Update getting-started slides.

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commit b81f6ed352bcadd7fd12230317eb331974011a1c 1 parent f7ff379
@bos authored
Showing with 217 additions and 55 deletions.
  1. +0 −52 slides/slides.html
  2. +217 −3 slides/slides.md
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52 slides/slides.html
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- </script>
-</head>
-<body>
-<div class="slide cover title">
- <h1 class="title">Haskell: Functional Programming, Solid Code, Big Data</h1>
- <p class="author">
-Bryan O'Sullivan
- </p>
- <p class="date">2011-09-18</p>
-</div>
-<div class="slide">
-
-<h1>Slides!</h1>
-<p>Yep, we got 'em.</p>
-<pre class="sourceCode"><code class="sourceCode haskell">main <span class="fu">=</span> <span class="fu">putStrLn</span> <span class="st">&quot;hello!&quot;</span></code></pre>
-</div>
-</body>
-</html>
View
220 slides/slides.md
@@ -2,10 +2,224 @@
% Bryan O'Sullivan
% 2011-09-18
-# Slides!
-
-Yep, we got 'em.
+# Welcome!
~~~~ {.haskell}
main = putStrLn "hello!"
~~~~
+
+* My name is Bryan O'Sullivan
+
+* I started using Haskell in 1993
+
+* I wrote a book about it, "Real World Haskell"
+
+ * [realworldhaskell.org](http://book.realworldhaskell.org/)
+
+* I write lots of open source code
+
+ * [github.com/bos](https://github.com/bos)
+
+* My company invests heavily and openly in Haskell
+
+ * [github.com/mailrank](https://github.com/mailrank)
+
+
+# My Haskell background
+
+* Began using Haskell at university
+
+* When I graduated in 1995, I switched to more mainstream languages
+
+ * C, C++, Java, Python, Perl, etc.
+
+* My interest reawakened around 2005
+
+* I've found Haskell to be a great general-purpose language
+
+* The community of people is amazing
+
+
+# What to expect
+
+* This is a *hands-on* workshop: you'll be writing code!
+
+* There will be a short break every 45 minutes
+
+* Don't be afraid to ask questions!
+
+
+# Your tools
+
+* You've already installed the Haskell Platform, right?
+
+ * [hackage.haskell.org/platform](http://hackage.haskell.org/platform/)
+
+* This gives us a great toolchain
+
+ * The GHC compiler (`ghc`)
+
+ * The GHCi interpreter (`ghci`)
+
+ * The Cabal package manager (`cabal`)
+
+ * Some handy libraries and tools
+
+
+# What else is needed?
+
+* A text editor
+
+* A terminal window
+
+
+# Let's get started!
+
+Create a file named `Hello.hs` and give it the following contents:
+
+~~~~ {.haskell}
+main = putStrLn "hello, world!"
+~~~~
+
+The suffix `.hs` is the standard for Haskell source files.
+
+File names start with a capital letter, and everyone uses `CamelCase`.
+
+
+# Building it
+
+This command will look for `Hello.hs` in the current directory, and
+compile it:
+
+~~~~
+ghc --make Hello
+~~~~
+
+The generated executable will be named `Hello` (`Hello.exe` on
+Windows).
+
+* That `--make` option up there tells GHC to automatically deal with
+ dependencies on source files and packages.
+
+
+# Checking in
+
+Is everyone able to build and run their `Hello` executable?
+
+
+# Something a little more convenient
+
+It's nice to have fast, native code at our fingertips.
+
+But when *I'm* working, I expect a few things:
+
+* I do lots of exploration.
+
+* I make tons of mistakes.
+
+For these circumstances, a full compiler is a bit slow.
+
+Instead, I often use the interactive interpreter, `ghci`.
+
+
+# Let's start GHCi
+
+Easily done:
+
+~~~~
+ghci
+~~~~
+
+It will display a startup banner, followed by a prompt:
+
+~~~~
+Prelude>
+~~~~
+
+This default prompt tells us which modules are available to play with.
+
+
+# Play around
+
+The `ghci` interpreter evaluates expressions interactively.
+
+Try it out:
+
+~~~~ {.haskell}
+2 + 2
+~~~~
+
+~~~~ {.haskell}
+"foo" ++ "bar"
+~~~~
+
+(That `++` is the string append operator.)
+
+
+# Directives
+
+All interpreter directives start with a "`:`" character.
+
+Let's load our source file into `ghci`:
+
+~~~~
+:load Hello.hs
+~~~~
+
+Now the `ghci` prompt changes:
+
+~~~~
+*Main>
+~~~~
+
+
+# Running our code in ghci
+
+We defined a function named `main`, so let's invoke it:
+
+~~~~
+main
+~~~~
+
+Did that work for you?
+
+
+# A few more useful directives
+
+Remember, they all start with a "`:`".
+
+* `:help` tells us what directives are available.
+
+* `:reload` reloads the file we last `:load`ed.
+
+* `:edit` launches our text editor on the file you most recently
+ `:load`ed. (Does *not* automatically `:reload`.)
+
+* `:quit` exits back to the shell.
+
+
+# Final ghci efficiency tips
+
+We can abbreviate directives:
+
+* `:e` is treated as `:edit`
+
+* `:r` is `:reload`
+
+We also have command line history and editing.
+
+* On Unix, compatible with `readline`.
+
+* On Windows, the same as `cmd.exe`.
+
+
+# Getting used to the cycle
+
+Use `:edit` or your text editor to change the "hello" text.
+
+Use `:reload` to reload the source file.
+
+Test out your redefinition of `main`.
+
+* For practice, hit the "up arrow" key to cycle through your command
+ history until you get back to the last time you typed `main`.
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