chaining.md

chaining

Some procedures will work with the incoming f.ret if there is no fitting argument provided to them directly.

[ 'a' 'b' 'c' 'd' ]
  map
    def v
      + v v      # f.ret is now [ 'aa' 'bb' 'cc' 'dd' ]
  collect
    + elt elt    # f.ret is now [ 'aaaa' 'bbbb' 'cccc' 'dddd' ]

or

[ 'a' 'b' 'c' 'd' ]
  map (def v \ + v v)
  collect \ + elt elt

Equivalent to Ruby's:

%w[ a b c d ]
  .map { |v| v + v }
  .collect { |v| v + v }

Procedures able to "chain":

• all?
• any?
• empty?
• each and for-each
• filter and select
• find and detect
• flatten
• includes?
• keys and values
• length
• map and collect
• merge
• c_map and c_collect
• reduce and inject
• reverse
• slice and index
• downcase, lowercase, lowcase, upcase, uppercase, capitalize