nsmmrs

void main() {

  final List<List<int>> grid = [
    [1,2,3],
    [4,5,6],
  ];

  // I thought this would fail to compile
  // since grid[2] could be null:
  print(grid[2][3]);

nsmmrs

def lazy_demo(n, group_size:n, groups:n)
  (1..Float::INFINITY)
    .lazy
    .map{|x| x * n }
    .select{|product| product.even? }
    .each_slice(group_size)
    .map{|group| group.map(&:to_s).join(",") }
    .first(groups)
end

nsmmrs

class ApplicationRecord

  def self.random
    max = maximum(primary_key)

    return if max.nil?

    find_random = lambda do
      order(primary_key).find_by(primary_key => (rand(max)..))
    end

nsmmrs

class ApplicationRecord

  def add_error(attribute, type, message=nil)
    attribute = attribute.to_s.to_sym
    type = type.to_s.to_sym

    errors.add attribute, type, message: message
  end

  def has_error?(attribute, type)

nsmmrs

class ApplicationRecord

  def self.string_enum(column_name, values, **options)
    enum column_name => values.map(&:to_s).index_by(&:itself), **options
  end

end

nsmmrs

class Hash

	def deep_slice(schema)
		self.class.deep_slice(self, schema)
	end

	def self.deep_slice(hash, schema)
	  nested_schemas = schema.last.is_a?(Hash) ? schema.last : {}
	  keys = schema.reject{|e| e.is_a?(Hash) } + nested_schemas.keys

nsmmrs

class Hash

  def shape
    self.class.shape_of self
  end

  def self.shape_of(hash)
    hash.sort_by{|k,v| k.to_s }.map do |k,v|
      v = case v
      when Array

nsmmrs

class Hash
	
  def self.breadcrumbs(hash)
    hash.flat_map do |k,v|
      if v.is_a?(Hash)
        breadcrumbs(v).map{|p| [k, *p]}
      else
        [k]
      end
    end

nsmmrs

require "open3"
require "json"

class ShellCommand

  attr_reader :line, :stdin, :binmode, :stdout, :stderr, :status

  def initialize(line, stdin, binmode, stdout, stderr, status)
    @line = line
    @stdin = stdin

nsmmrs

module ValueObject
  def ==(other)
    case other
    when ValueObject
      self.object_value == other.object_value
    else
      false
    end
  end