Masa331

Configuring linux XTerms font

XTerm can be widely configured with with use of ~/.Xresources

Font particularly can be set with line xterm*font [options]. For example mine looks like:

xterm*font: -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1

It configures different aspects of displayed font but it's hard to generate(and understand) manually.

Masa331

counter = 0
alphabet = %w(a b c d e f g h i j k l m n o p q r s t u v w x y z)

alphabet.permutation.each do |permutation|
  permutation.join.to_sym

  counter += 1
  if counter % 100000 == 0
    puts Symbol.all_symbols.size
  end

Masa331

class PrimeNumbers
  def self.each
    yield 1
    yield 2
    yield 3
    yield 5
    yield 7
    yield 11
  end
end

Masa331

class UnderFiveIterator
  def initialize(collection)
    @collection = collection
  end
  
  def each_under_five
    @collection.each do |item|
      if item < 5
        yield item
      end

Masa331

collection = [1, 2, 3]

collection.each # or other Enumerable method without block
# => #<Enumerator: ...>
collection.to_enum # or collection.enum_for which is alias
# => #<Enumerator: ...>

Masa331

enum = [1, 2, 3].each

enum.each do { |number| puts number }
# 1
# 2
# 3
# => [1, 2, 3]

Masa331

enum = [1, 2, 3].each

enum.next
# => 1
enum.next
# => 2
enum.next
# => 3
enum.next
# => StopIteration: iteration reached an end

Masa331

enum = Enumerator.new do |yielder|
  yielder.yield 1
end

enum.each { |item| puts item }
# 1

Masa331

enum = Enumerator.new do |yielder|
  10.times do
    yielder.yield 1
  end
end

Masa331

enum = Enumerator.new do |yielder|
  loop do
    yielder.yield 1
  end
end