Description to self about certain ruby methods. For safe keeping really. If you've stumbled on here for some reason, hello!

Sandbox.rb

# Enumerable's Detect
# - returns first element for which block returns true and then stops. If none returns nil.

(1..100).detect  { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35

# Find All

(1..10).find_all { |i|  i % 3 == 0 }   #=> [3, 6, 9]

# Reject

(1..10).reject { |i|  i % 3 == 0 }   #=> [1, 2, 4, 5, 7, 8, 10]

# Select
# Same as find_all

[1,2,3,4,5].select { |num|  num.even?  }   #=> [2, 4]

# Inject
# Reduce alias, with or without supplied default

%w{ cat sheep bear }.inject do |memo, word|
  puts "memo: #{memo}"
  puts "word: #{word}"
  memo.length > word.length ? memo : word
end

# memo: cat
# word: sheep
# memo: sheep
# word: bear


%w{ cat sheep bear }.inject('huh') do |memo, word|
  puts "memo: #{memo}"
  puts "word: #{word}"
  memo.length > word.length ? memo : word
end

# memo: huh
# word: cat
# memo: cat
# word: sheep
# memo: sheep
# word: bear

# Inspect
# String version of self, alias of 'to_s'

[ "a", "b", "c" ].to_s     #=> "[\"a\", \"b\", \"c\"]"