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assert('Object#instance_exec') do
class KlassWithSecret
def initialize
@secret = 99
end
end
k = KlassWithSecret.new
assert_equal 104, k.instance_exec(5) {|x| @secret+x }
end
assert('Object#tap') do
ret = []
(1..10) .tap {|x| ret << "original: #{x.inspect}"}
.to_a .tap {|x| ret << "array: #{x.inspect}"}
.select {|x| x%2==0} .tap {|x| ret << "evens: #{x.inspect}"}
.map { |x| x*x } .tap {|x| ret << "squares: #{x.inspect}"}
assert_equal [
"original: 1..10",
"array: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]",
"evens: [2, 4, 6, 8, 10]",
"squares: [4, 16, 36, 64, 100]"
], ret
assert_equal(:tap_ok, Class.new {def m; tap{return :tap_ok}; end}.new.m)
end
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