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Update ruby notes, small updates to JS, ffmpeg and docker notes
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‎notes/language/javascript/fetch.md

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---
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title: Fetch
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ref: https://developer.mozilla.org/en-US/docs/Web/API/Window/fetch
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---
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## Basic
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Issue a GET request:
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```js
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fetch('https://example.com/').then(res => console.log(res.status));
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```

‎notes/language/ruby/array.md

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---
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title: Array
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ref: https://docs.ruby-lang.org/en/3.4/Array.html
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---
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## Basic
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```ruby
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my_array = [1, 2, 3]
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my_array = (1..10).to_a
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my_array.push(40)
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my_array << 40 # Same as push
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```
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## Methods
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| Method | Description |
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| ---------- | ----------------------------------------------------------------- |
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| `push` | Appends each argument to the array. |
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| `sort` | Returns a new array sorted. |
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| `sort_by!` | Sort in place by using the given block. |
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| `reverse` | Returns a new array in inverse order. |
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| `map` | Returns a new array with each element updated by the given block. |
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| `collect` | Same as `map`. |
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Update elements order:
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```ruby
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my_array.sort! do |v1, v2|
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v1 <=> v2
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end
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my_array = my_array.sort_by do |key, value|
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value
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end
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my_array.reverse!
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```
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## Map
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Calculate the square of every element:
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```ruby
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my_nums.map { |num| num ** 2 }
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my_nums.collect { |num| num ** 2 }
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```

‎notes/language/ruby/basic_types.md

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title: Basic types
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---
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## Types
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```ruby
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my_name = "Taro" # String
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my_int = 10 # Integer
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my_float = 3.14
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my_bool = true
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my_nil = nil
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my_symbol = :hello # Symbol
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```
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To convert between types:
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```ruby
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my_name.to_sym # to symbol
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my_name.intern # to symbol
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my_symbol.to_s # to string
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```
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## Check if an object can receive a method
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my_var.respond_to?(:next)
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my_int.next # Add 1 to an integer
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my_int.to_s # Convert to string
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Number operations:
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```ruby
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my_int.next # Add 1 to an integer
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my_float.floor # Round down
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```
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Check if an object can receive a method:
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## Assign the result to the variable
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```ruby
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my_var.respond_to?(:next)
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```
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Assign the result to the variable by using `!`:
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```ruby
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my_name.capitalize!
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```
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## Methods that return boolean
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Methods that return boolean use `?`:
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```ruby
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string_to_check.include? "substring"
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```

‎notes/language/ruby/builtin_functions.md ‎notes/language/ruby/builtin.md

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---
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title: Built-in functions
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title: Built-in
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---
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## Interactive Console
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Run the command:
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```shell
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irb
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```
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## Functions
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```ruby
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print "Hello" # Prints something and do NOT put a new line
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puts "Hello" # Prints something and puts a new line at the end
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my_name = gets # Gets the input from the user
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my_name = gets.chomp # Same as gets but removes the new line
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```
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## Comments
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```ruby
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# One line comment
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=begin
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I'm a comment!
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I don't need any # symbols.
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=end
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```

‎notes/language/ruby/class.md

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title: Class
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---
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## Basic
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```ruby
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class BaseClass
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include Math # Variables and methods are inherited to class instances

‎notes/language/ruby/comments.md

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‎notes/language/ruby/control_flow.md

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title: Control flow
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---
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## Condition
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```ruby
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if cond1
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do_something
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do_something unless cond
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cond ? was_true : was_false
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```
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## Switch
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```ruby
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case my_var
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when 0
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do_something

‎notes/language/ruby/hash.md

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---
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title: Hash
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ref: https://docs.ruby-lang.org/en/3.4/Hash.html
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---
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## Basic
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```ruby
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my_hash = Hash.new
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my_hash = Hash.new("default value")

‎notes/language/ruby/interactive_console.md

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‎notes/language/ruby/library/http.md

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---
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title: Net::HTTP
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ref: https://docs.ruby-lang.org/en/3.4/Net/HTTP.html
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---
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## Basic
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```ruby
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require 'net/http'
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Net::HTTP.get('example.com', '/index.html')
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```

‎notes/language/ruby/method.md

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title: Method
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---
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## Basic
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Without parameters:
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```ruby
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## Simple case
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def method_name
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do_something
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end
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method_name # Call it
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```
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## With parameters
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With parameters:
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```ruby
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def method_name(param=5, *splat)
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# splat becomes an array
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do_something

‎notes/language/ruby/module.md

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title: Module
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---
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## Basic
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Unlike classes, instances cannot be created,
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and cannot have subclasses.
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‎notes/language/ruby/operators.md

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title: Operators
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---
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```ruby
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my_var = "something"
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my_var ||= "something" # Only assign if it is nil
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my_int += 1
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my_int -= 1
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my_int *= 2
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my_int /= 2
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v1 == v2
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v1 != v2
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v1 > v2
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v1 < v2
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v1 >= v2
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v1 <= v2
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v1 <=> v2 # -1, 0, 1 (less, equal, greater)
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c1 && c2
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c1 || c2
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!cond
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```
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## Arithmetic
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| Operator | Description |
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| -------- | ------------------------------------------ |
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| `+` | Addition or unary plus |
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| `-` | Subtraction or unary minus |
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| `*` | Multiplication |
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| `/` | Division |
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| `%` | Remainder after division (modulo division) |
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| `**` | Exponentiation |
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## Assignment
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| Operator | Example | Same as |
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| -------- | ----------- | ------------------------------------- |
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| `=` | `a = b` | `a = b` |
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| `+=` | `a += b` | `a = a + b` |
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| `-=` | `a -= b` | `a = a - b` |
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| `*=` | `a *= b` | `a = a * b` |
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| `/=` | `a /= b` | `a = a / b` |
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| `\|\|=` | `a \|\|= b` | `a = b if a == nil or a == false` |
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| `\|\|=` | `a \|\|= b` | `a = b unless a == nil or a == false` |
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## Relational
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| Operator | Description |
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| -------- | --------------------------------- |
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| `==` | Equal to |
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| `!=` | Not equal to |
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| `>` | Greater than |
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| `<` | Less than |
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| `>=` | Greater than or equal to |
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| `<=` | Less than or equal to |
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| `<=>` | Less, equal or greater (-1, 0, 1) |
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## Logical
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| Operator | Description |
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| ------------- | ----------- |
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| `&&` `and` | AND |
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| `\|\|` `or` | OR |
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| `!` | NOT |
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## Bitwise
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| Operator | Description |
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| -------- | ----------- |
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| `&` | AND |
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| `\|` | OR |
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| `^` | XOR |
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| `<<` | Shift left |
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| `>>` | Shift right |

‎notes/language/ruby/string.md

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---
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title: String
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ref: https://docs.ruby-lang.org/en/3.4/String.html
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---
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## Basic
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```ruby
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my_string = "Taro"
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‎notes/language/ruby/time.md

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---
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title: Time
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ref: https://docs.ruby-lang.org/en/3.4/Time.html
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---
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## Basic
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```ruby
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now = Time.now
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```

‎notes/language/rust/crates/chrono.md

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use chrono::prelude::*;
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fn main() {
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let now: DateTime<Local> = Local::now();
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let now = Local::now();
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println!("{}", now.format("%Y-%m-%d %H:%M:%S"));
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}
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```

‎notes/language/rust/numbers.md

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| `floor` | Largest integer less than or equal to number. |
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| `ceil` | Smallest integer greater than or equal to number. |
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| `trunc` | Integer part without fractional digits. |
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| `max` | Highest number. |
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| `min` | Lowest number. |
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Example:
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let round_pi = pi.round();
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```
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Between two floats `a` and `b`,
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return the highest or lowest:
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```rust
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a.max(b) // f32::max(a, b)
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a.min(b) // f32::min(a, b)
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```
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## Update reference
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If updating a number in a function that received it as `&mut`:

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