From 7ac4aa8e2d19d55348c25b5afc64bebc8ed2413b Mon Sep 17 00:00:00 2001
From: "Rico Sta. Cruz" <rstacruz@users.noreply.github.com>
Date: Thu, 2 Jun 2016 17:39:31 +0800
Subject: [PATCH] Update

---
 elixir.md             | 139 +++++++++++++++++++++++++++++++++++++++---
 phoenix-migrations.md |  79 ++++++++++++++++++++++++
 phoenix.md            |  39 ++++++++++++
 3 files changed, 249 insertions(+), 8 deletions(-)
 create mode 100644 phoenix-migrations.md
 create mode 100644 phoenix.md

diff --git a/elixir.md b/elixir.md
index bc9fa65d8..d2b9ef614 100644
--- a/elixir.md
+++ b/elixir.md
@@ -32,6 +32,7 @@ is_reference/1
 left != right   # equal
 left !== right  # match
 left ++ right   # concat lists
+left <> right   # concat string/binary
 left =~ right   # regexp
 ```
 
@@ -76,20 +77,142 @@ Map.put(map, key, value)
 ### String
 
 ```elixir
-String.length(str)
-String.codepoints(string)
-String.slice(str, 0..-1)
-String.split(str, " ")
-String.capitalize(str)
-String.match(string, regex)
+import String
+str = "hello"
+str |> length()      #=> 5
+str |> codepoints()  #=> ["h", "e", "l", "l", "o"]
+str |> slice(2..-1)  #=> "llo"
+str |> split(" ")    #=> ["hello"]
+str |> capitalize()  #=> "Hello"
+str |> match(regex)
+```
+
+### Float
+
+```elixir
+import Float
+n = 10.3
+n |> ceil()            #=> 11.0
+n |> ceil(2)           #=> 11.30
+n |> to_string()       #=> "1.030000+e01"
+n |> to_string([decimals: 2, compact: true])
+
+Float.parse("34")  #=> { 34.0, "" }
+```
+
+### Integer
+
+```elixir
+import Integer
+n = 12
+digits(n)        #=> [1, 2]
+to_char_list(n)  #=> '12'
+to_string(n)
+is_even(n)
+is_odd(n)
+
+# Different base:
+digits(n, 2)       #=> [1, 1, 0, 0]
+to_char_list(n, 2) #=> '1100'
+to_string(n, 2)
+
+parse("12")       #=> 12
+undigits([1, 2])  #=> 12
+```
+
+### Type casting
+
+```elixir
+Float.parse("34.1")    #=> {34.1, ""}
+Integer.parse("34")    #=> {34, ""}
+
+Float.to_string(34.1)  #=> "3.4100e+01"
+Float.to_string(34.1, [decimals: 2, compact: true])  #=> "34.1"
+```
+
+### Map
+
+```js
+import Map
+map = %{id: 1, name: "hi"}
+
+delete(map, :name)    #=> "hi"
+pop(map, :name)       #=> %{id: 1}
+
+put(map, :id, 2)      #=> %{id: 2, name: "hi"}
+put_new(map, :id, 2)  # only if `id` doesn't exist
+
+get(map, :id)         #=> 1
+keys(map)             #=> [:id, :name]
+values(map)           #=> [1, "hi"]
+
+to_list(map)          #=> [id: 1, name: "hi"]
+                      #=> [{:id, 1}, {:name, "hi"}]
+
+merge(map, %{name: "hello"})
+
+Map.new([{:b, 1}, {:a, 2}])
+Map.new([a: 1, b: 2])
+Map.new([:a, :b], fn x -> {x, x} end)  #=> %{a: :a, b: :b}
+```
+
+### List
+
+Also see [Enum](#enum).
+
+```js
+import List
+list = [ 1, 2, 3, 4 ]
+
+first(list)
+last(list)
+
+flatten(list)
+flatten(list, tail)
 ```
 
 ### Enum
 
 ```elixir
-Enum.reduce(list, acc, fn)
-Enum.map(list, fn)
 # consider streams instead
+import Enum
+
+# High-order
+reduce(list, acc, fn)
+map(list, fn)
+reject(list, fn)
+any?(list, fn)
+empty?(list, fn)
+
+list = [:a, :b, :c]
+at(list, 0)         #=> :a
+count(list)         #=> 3
+empty?(list)        #=> false
+any?(list)          #=> true
+
+concat(list, [:d])  #=> [:d]
 ```
 
 There's really way too many things, just see <https://learnxinyminutes.com/docs/elixir/>.
+
+## Syntax
+
+### [Structs](http://elixir-lang.org/getting-started/structs.html)
+
+```elixir
+defmodule User do
+  defstruct name: "", age: nil
+end
+
+%User{name: "John", age: 20}
+```
+
+### Functions
+
+### Function heads
+
+```elixir
+def join(a, b \\ nil)
+def join(a, b) when is_nil(b) do: a end
+def join(a, b) do: a <> b; end
+```
diff --git a/phoenix-migrations.md b/phoenix-migrations.md
new file mode 100644
index 000000000..b8a61cf38
--- /dev/null
+++ b/phoenix-migrations.md
@@ -0,0 +1,79 @@
+---
+title: Phoenix: Migrations
+category: Elixir
+---
+
+## Creating
+
+```
+$ mix ecto.gen.migration  add_posts_table
+  creating priv/repo/migrations/20160602085927_add_posts_table.exs
+  ...
+
+$ mix ecto.migrate
+$ mix ecto.rollback
+```
+
+
+## Tables
+
+```elixir
+create table(:documents) do
+  add :title, :string
+  add :title, :string, size: 40
+  add :title, :string, default: "Hello"
+  add :title, :string, default: fragment("now()")
+  add :title, :string, null: false
+  add :body, :text
+  add :age, :integer
+  add :price, :float
+  add :price, :float, precision: 10, scale: 2
+  add :published_at, :datetime
+  add :group_id, references(:groups)
+  add :object, :json
+
+  timestamps  # inserted_at and updated_at
+end
+
+create_if_not_exists table(:documents) do: ... end
+```
+
+```elixir
+alter table(:posts) do
+  add :summary, :text
+  modify :title, :text
+  remove :views
+end
+```
+
+```elixir
+rename table(:posts), :title, to: :summary
+rename table(:posts), to: table(:new_posts)
+```
+
+```elixir
+drop table(:documents)
+drop_if_exists table(:documents)
+
+table(:documents)
+table(:weather, prefix: :north_america)
+```
+
+## Indices
+
+```elixir
+create index(:posts, [:slug], concurrently: true)
+create unique_index(:posts, [:slug])
+drop index(:posts, [:name])
+```
+
+## Execute
+
+```elixir
+execute "UPDATE posts SET published_at = NULL"
+execute create: "posts", capped: true, size: 1024
+```
+
+## References
+
+* [Ecto.Migration](http://devdocs.io/phoenix/ecto/ecto.migration)
diff --git a/phoenix.md b/phoenix.md
new file mode 100644
index 000000000..9f1479af6
--- /dev/null
+++ b/phoenix.md
@@ -0,0 +1,39 @@
+---
+title: Phoenix
+category: Elixir
+---
+
+### Directory
+
+```
+config/
+web/
+  controllers/
+  models/
+  views/
+
+  templates/
+  static/
+```
+
+## Migrations
+
+```
+$ mix ecto.gen.migration  add_posts_table
+  creating priv/repo/migrations/20160602085927_add_posts_table.exs
+  ...
+
+$ mix ecto.migrate
+```
+
+### [Ecto.Migration](http://devdocs.io/phoenix/ecto/ecto.migration)
+
+```
+create index(:posts, [:slug], concurrently: true)
+create table(:documents) do
+  add :body, :string
+  add :deletion_key, :string
+
+  timestamps
+end
+```