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Gabriel Gonzalez 2015-09-01 17:24:41 -07:00
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slides/slides.md
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@ -41,7 +41,7 @@ $ cabal install turtle-1.1.0
* Folds * Folds
* Patterns * Patterns
I've hosted slides on go/learn so that people can follow along locally I'm hosting slides on Github so that people can follow along locally
# Overview of Haskell # Overview of Haskell
@ -58,13 +58,13 @@ Haskell can be both **interpreted** or **compiled** to a native binary
Haskell is a managed language, providing garbage collection, concurrency, and Haskell is a managed language, providing garbage collection, concurrency, and
transactional shared memory: transactional shared memory:
* **Garbage collection** is generational and efficient (measured in GB / s) * **Garbage collection** is efficient (throughput measured in GB / s)
* **Concurrency** uses green-threads and is efficient (world record for SDN) * **Concurrency** uses green-threads and is efficient (can handle 1M threads)
* **Transactional memory** simplifies race-free concurrent code without polling * **Transactional memory** simplifies race-free concurrent code
# Biggest disadvantages of Haskell # Big disadvantages of Haskell
* Not a JVM language * No JVM backend
* Beginners can't easily reason about performance * Beginners can't easily reason about performance
* Built-in record syntax is clumsy * Built-in record syntax is clumsy
* Most language features are libraries, which hampers discoverability * Most language features are libraries, which hampers discoverability
@ -122,7 +122,7 @@ import Turtle --
main = echo "Hello, world!" -- echo Hello, world! main = echo "Hello, world!" -- echo Hello, world!
``` ```
... then run the example: ... then run the example script:
```bash ```bash
$ chmod u+x example.hs $ chmod u+x example.hs
@ -133,7 +133,7 @@ Hello, world!
# Create a native binary # Create a native binary
```bash ```bash
$ ghc -O2 -threaded example.hs $ ghc -O2 example.hs
$ ./example $ ./example
Hello, world! Hello, world!
``` ```
@ -312,7 +312,7 @@ main = do --
```haskell ```haskell
$ ./example.hs $ ./example.hs
2015-01-24 03:40:31 UTC 2015-09-01 23:56:03.245 UTC
``` ```
Why not this? Why not this?
@ -341,6 +341,17 @@ scala> for { x <- Seq(1, 2); y <- Seq(3, 4) } yield (x, y)
res0: Seq[(Int, Int)] = List((1,3), (1,4), (2,3), (2,4)) res0: Seq[(Int, Int)] = List((1,3), (1,4), (2,3), (2,4))
``` ```
... or LINQ/`from`/`select` in C#:
```cs
List<int> xs = new List<int> { 1, 2 }
List<int> ys = new List<int> { 3, 4 }
var result =
from x in xs
from y in ys
select Tuple<int, int>(x, y)
```
# Nesting subroutines # Nesting subroutines
```haskell ```haskell
@ -362,7 +373,7 @@ Same result:
```haskell ```haskell
$ ./example.hs $ ./example.hs
2015-01-24 03:40:31 UTC 2015-09-01 23:56:03.245 UTC
``` ```
# Unnecessary `return` # Unnecessary `return`