Module: Enumerable

Included in:
ConfigScript
Defined in:
lib/langhelp/langhelp-sub.rb,
lib/langhelp/langhelp-sub.rb,
lib/langhelp/langhelp-sub.rb

Overview

map_with_index

Instance Method Summary collapse

Instance Method Details

#build_hash ⇒ Object

Like #map/#collect, but it generates a Hash. The block is expected to return two values: the key and the value for the new hash. numbers = (1..3) squares = numbers.build_hash { |n| [n, nn] } # 1=>1, 2=>4, 3=>9 sq_roots = numbers.build_hash { |n| [nn, n] } # 1=>1, 4=>2, 9=>3



738
739
740
741
742
743
744
745
 
# File 'lib/langhelp/langhelp-sub.rb', line 738

def build_hash
  result = {}
  self.each do |elt|
    key, value = yield elt
    result[key] = value
  end
  result
end

#map_with_index ⇒ Object

Same as Enumerable#map, but the index is yielded as well. See Enumerable#each_with_index. puts files.map_with_index { |fn, idx| "#idx. #fn" } print "Please select a file (0-#Enumerable.filesfiles.size): "



757
758
759
760
761
762
763
 
# File 'lib/langhelp/langhelp-sub.rb', line 757

def map_with_index
  result = []
  self.each_with_index do |elt, idx|
    result << yield(elt, idx)
  end
  result
end

#mapf(message) ⇒ Object

"map function" enum.mapf(:x) is short for enum.map { |elt| elt.x }



724
725
726
 
# File 'lib/langhelp/langhelp-sub.rb', line 724

def mapf(message)
  self.map { |elt| elt.send(message) }
end