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enumerable.rb
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enumerable.rb
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module Enumerable
def first(*args)
if args.empty?
self.each { |e| return e }
nil
else
take(*args)
end
end
def map(&block)
return self.enum_for(:map) unless block
result = []
self.each do |x|
result << (yield x)
end
result
end
alias collect map
def inject(*args)
dropped = 0
meth = nil
case args.length
when 0
memo = self.first
dropped = 1
when 1
memo = args[0]
when 2
memo = args[0]
meth = args[1]
end
self.drop(dropped).each do |x|
if meth
memo = memo.send(meth, x)
else
memo = (yield memo, x)
end
end
memo
end
alias reduce inject
def each_with_index
i = 0
self.each do |obj|
yield obj, i
i += 1
end
end
def all?(&block)
self.each do |obj|
return false unless (block ? block.call(obj) : obj)
end
true
end
def any?(&block)
self.each do |obj|
return true if (block ? block.call(obj) : obj)
end
false
end
def select(&block)
return self.enum_for(:select) unless block
result = []
self.each do |o|
if block.call(o)
result << o
end
end
result
end
alias :find_all :select
def include?(obj)
self.each do |o|
return true if o == obj
end
false
end
alias member? include?
def drop(n)
raise ArgumentError.new("attempt to drop negative size") if n < 0
result = self.to_a
return [] if n > result.size
result[n...result.size]
end
def drop_while(&block)
result = []
dropping = true
self.each do |o|
unless dropping && yield(o)
result << o
dropping = false
end
end
result
end
def to_a
result = []
self.each do |i|
result << i
end
result
end
alias entries to_a
def detect(ifnone = nil, &block)
return self.enum_for(:detect) unless block
self.each do |o|
return o if block.call(o)
end
return ifnone
end
alias find detect
def take(n)
n = Topaz.convert_type(n, Fixnum, :to_int)
raise ArgumentError.new("attempt to take negative size") if n < 0
result = []
unless n == 0
self.each do |o|
result << o
break if result.size == n
end
end
result
end
def take_while(&block)
return self.enum_for(:take_while) unless block
result = []
self.each do |o|
break unless yield(o)
result << o
end
result
end
def reject(&block)
return self.enum_for(:reject) unless block
result = []
self.each do |o|
result << o unless yield(o)
end
result
end
def max(&block)
max = nil
self.each_with_index do |e, i|
max = e if i == 0 || Topaz.compare(e, max, &block) > 0
end
max
end
def min(&block)
min = nil
self.each_with_index do |e, i|
min = e if i == 0 || Topaz.compare(e, min, &block) < 0
end
min
end
def max_by(&block)
return self.enum_for(:max_by) unless block
max = maxv = nil
self.each_with_index do |e, i|
ev = yield(e)
max, maxv = e, ev if i == 0 || Topaz.compare(ev, maxv) > 0
end
max
end
def min_by(&block)
return self.enum_for(:min_by) unless block
min = minv = nil
self.each_with_index do |e, i|
ev = yield(e)
min, minv = e, ev if i == 0 || Topaz.compare(ev, minv) < 0
end
min
end
def minmax(&block)
min = max = nil
self.each_with_index do |e, i|
min = e if i == 0 || Topaz.compare(e, min, &block) < 0
max = e if i == 0 || Topaz.compare(e, max, &block) > 0
end
[min, max]
end
def minmax_by(&block)
return self.enum_for(:minmax_by) unless block
min = max = minv = maxv = nil
self.each_with_index do |e, i|
ev = yield(e)
max, maxv = e, ev if i == 0 || Topaz.compare(ev, maxv) > 0
min, minv = e, ev if i == 0 || Topaz.compare(ev, minv) < 0
end
[min, max]
end
def partition(&block)
return self.enum_for(:partition) unless block
a, b = [], []
self.each do |e|
block.call(e) ? a.push(e) : b.push(e)
end
[a, b]
end
def count(*args, &block)
c = 0
if args.empty?
if block
self.each { |e| c += 1 if block.call(e) }
else
self.each { c += 1 }
end
else
arg = args[0]
self.each { |e| c += 1 if e == arg }
end
c
end
end