Module: LazyList::ModuleFunctions

Included in:
LazyList, LazyList
Defined in:
lib/lazylist.rb

Overview

This module contains module functions, that are added to LazyList and it’s instances.

Instance Method Summary collapse

Instance Method Details

#delay(&block) ⇒ Object

Delay the value of block to a Promise.



234
235
236
 
# File 'lib/lazylist.rb', line 234

def delay(&block)
  MemoPromise.new(&block)
end

#force(obj) ⇒ Object

Force the delayed obj to evaluate to its value.



239
240
241
242
243
244
245
246
 
# File 'lib/lazylist.rb', line 239

def force(obj)
  case obj
  when Promise
    force obj.__value__
  else
    obj
  end
end

#mix(*lists) ⇒ Object

Returns a LazyList, that consists of the mixed elements of the lists _lists without any special order.



250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
 
# File 'lib/lazylist.rb', line 250

def mix(*lists)
  return empty if lists.empty?
  first = lists.shift
  if lists.empty?
    first
  elsif first.empty?
    mix(*lists)
  else
    LazyList.new(first.head) do
      t = first.tail
      lists = lists.push t unless t.empty?
      mix(*lists)
    end
  end
end