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|
# = TITLE:
#
# Mapcar
#
# AUTHOR:
#
# Cosmin Bonchis
#
# NOTES:
#
# Google Summer of Code 2007 project for Ruby Central Inc.
#
# TODO:
# - #mapcar should ne be defined in toplevel. But Matrix
# is using it at class-level. WTF?
require 'generator'
#module Enumerable
# Non-recursive mapcar (works on all Enumerables)
def mapcar(*enums)
generators = enums.collect { |e| Generator.new(e) }
result = []
while true
begin
params = generators.collect { |g| g.current; g.next }
rescue EOFError
return result
end
result << yield(*params)
end
end
#
def map(*enums)
generators = []; enums.each { |e| generators << Generator.new(e) }
while true
begin
params = []; generators.each { |g| g.current; params << g.next }
rescue EOFError
return
end
yield(*params)
end
end
#end
class Array
def self.map(n, *arrays)
len = arrays.length
if n == 0
n = arrays[0].length
1.upto(arrays.length - 1) do |i|
al = arrays[i].length
n = al if al < n
end
end
0.upto(n - 1) do |i|
params = []
0.upto(len - 1) do |arr|
params << arrays[arr][i]
end
yield(*params)
end
end
end
|
