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" Call DotnetRunAndShowVirtualText on file open & save
autocmd BufReadPost,BufWritePost *.cs |  call DotnetRunAndShowVirtualText()
" Delete virtual text on a buffer when it is modified
autocmd TextChanged,TextChangedI *.cs lua vim.api.nvim_buf_clear_namespace(0, -1, vim.fn.line(".") - 1, vim.fn.line("."))

highlight MyWarningVirtualText guifg=orange
highlight MyErrorVirtualText guifg=red

function! DotnetRunAndShowVirtualText()
  lua << EOF

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pub fn transpose(matrix: [[i32; 3]; 3]) -> [[i32; 3]; 3] {
  let mut transposed: [[i32; 3]; 3] = [[0; 3]; 3];

    for i in 0..matrix.len() {
      for j in 0..matrix[i].len() {
        transposed[i][j] = matrix[j][i];
      }
    }

  transposed

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ruby migrate.rb create ruby migrate.rb drop

$ irb

require_relative 'sequel'

user = User.first

user.send_welcome_email

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class LuckyNumbers
  attr_accessor :lucky_number
  LUCKY_NUMBER = 7
  INTERVAL = 9

  def initialize(min = 0)
    @lucky_number = min.to_i - 1
  end

  def lucky?(number)

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class ColorsEnum
  include Enumerable
  
  def initialize(colors)
    @colors = colors
  end

  def each(&block)
    block.call(@colors[0])
    @colors.shift

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require 'erb'

class BasicErb
  def initialize(template)
    @template = template
  end

  def greeting
    "Hello World!"
  end

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module AbstractInterface
  class InterfaceNotImplementedError < NoMethodError
  end

  def self.included(base)
    base.send(:include, AbstractInterface::Methods)
    base.send(:extend, AbstractInterface::Methods)
    base.send(:extend, AbstractInterface::ClassMethods)
  end

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O(1) = Immediately know exactly which element to visit (array by index, hash table lookup)
O(n) = Visit element once (find something in a list of unique values)
O(log n) = Loop the whole list multiple times but reduce its size each iteration roughly by half (sorting algorithms like quick sort [or is it merge sort]?)
O(n^2) = Loop the whole list for each element in the list (nested loops) (edited)

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# "In order to have a near-zero default footprint, Active Support does not 
# load anything by default. It is broken in small pieces so that you can 
# load just what you need, and also has some convenience entry points to 
# load related extensions in one shot, even everything."
require 'active_support'

# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/object/blank.rb
require 'active_support/core_ext/object/blank'

# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/object/inclusion.rb

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Concerns: modules that you mixin to the classes where they are needed