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[1] (pry) main: 0> 1.class | |
=> Fixnum | |
[2] (pry) main: 0> 1.method(:+) | |
=> #<Method: Fixnum#+> | |
[3] (pry) main: 0> 1 + 0 == 0 + 1 | |
=> true | |
[4] (pry) main: 0> 2.0.class | |
=> Float | |
[5] (pry) main: 0> 2.0.method(:*) |
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[1] (pry) main: 0> class AdditionMonoid | |
[1] (pry) main: 0* def identity | |
[1] (pry) main: 0* 0 | |
[1] (pry) main: 0* end | |
[1] (pry) main: 0* | |
[1] (pry) main: 0* def operation(a, b) | |
[1] (pry) main: 0* a + b | |
[1] (pry) main: 0* end | |
[1] (pry) main: 0* end | |
=> :operation |
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cat ./1-219.1.txt | convert \ | |
-font Courier \ | |
text:- \ | |
-rotate `convert null: -format '%[fx:rand()*15-7]' info:` \ | |
-attenuate 0.1247 +noise Gaussian \ | |
-colorspace Gray \ | |
1-219.1.pdf |
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class PerconaToolkit < Formula | |
desc "Percona Toolkit for MySQL" | |
homepage "https://www.percona.com/software/percona-toolkit/" | |
url "https://www.percona.com/downloads/percona-toolkit/2.2.19/tarball/percona-toolkit-2.2.19.tar.gz" | |
mirror "https://www.mirrorservice.org/sites/ftp.netbsd.org/pub/pkgsrc/distfiles/percona-toolkit-2.2.19.tar.gz" | |
mirror "https://dl.bintray.com/homebrew/mirror/percona-toolkit-2.2.19.tar.gz" | |
sha256 "e9f4d4730265813fa7a39ed8799d12ca5775c8e5d6fa27ff48bae11db0f7e671" | |
revision 1 | |
head "lp:percona-toolkit", :using => :bzr |
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import Kitura | |
import KituraNet | |
import KituraSys | |
let router = Router() | |
router.get("/") { | |
request, response, next in | |
response.send("Hello, World!") | |
next() |
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defmodule MyMod do | |
defmodule Base do | |
def __using__(_) do | |
end | |
end | |
@mod Application.get_env(:my_app, :mod, MyMod.Base) | |
use @mod | |
end |
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defmodule Contracts do | |
defmacro __using__(_opts) do | |
quote do | |
Module.register_attribute(__MODULE__, :requires, accumulate: true) | |
Module.register_attribute(__MODULE__, :ensures, accumulate: true) | |
@contracts %{} | |
import Kernel, except: [def: 2] | |
import Contracts, only: [def: 2] |
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% MIX_ENV=stag mix release | |
==> Building release with MIX_ENV=stag. | |
==> Generating relx configuration... | |
==> Merging custom relx configuration from rel/relx.config... | |
==> Generating sys.config... | |
==> Generating boot script... | |
==> Performing protocol consolidation... | |
==> Conform: Loading schema... | |
==> Conform: No schema found, conform will not be packaged in this release! | |
==> Generating release... |
Make illegal states unrepresentable. Use the type system as a tool to enforce invariants on the code you write. Choose your data types such that states that are illegal don’t show up as legal states in the program. Take this code representing various connection information as an example. It keeps track of relevant information in a fairly readable manner:
type connection_state =
| Connecting
| Connected
| Disconnected
type connection_info = {
state: connection_state
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