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class Object
def returning o; yield o; o end # k-combinator
end
module Enumerable
def count_of(&b); select(&b).size end
def max_of(&b); map(&b).max end
def min_of(&b); map(&b).min end
end
class Array
def uniq_by; inject({}) { |h, o| h[yield(o)] = o; h }.values end
end
class NilClass
def blank?; true end
end
module Enumerable
def map_with_index # sigh...
ret = []
each_with_index { |e, i| ret << yield(e, i) }
ret
end
def argfind
each { |e| x = yield(e); return x if x }
nil
end
def group_by
inject({}) do |groups, element|
(groups[yield(element)] ||= []) << element
groups
end
end if RUBY_VERSION < '1.9'
end
class Array
def first_duplicate
sa = sort
(1 .. sa.length).argfind { |i| (sa[i] == sa[i - 1]) && sa[i] }
end
def to_h
Hash[*flatten]
end
def flatten_one_level
inject([]) do |ret, e|
case e
when Array
ret + e
else
ret << e
end
end
end
end
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