# File lib/backports/2.0.0/array/bsearch.rb, line 3 def bsearch return to_enum(__method__) unless block_given? from = 0 to = size - 1 satisfied = nil while from <= to do midpoint = (from + to).div(2) result = yield(cur = self[midpoint]) case result when Numeric return cur if result == 0 result = result < 0 when true satisfied = cur when nil, false # nothing to do else raise TypeError, "wrong argument type #{result.class} (must be numeric, true, false or nil)" end if result to = midpoint - 1 else from = midpoint + 1 end end satisfied end