Confusion with the output came from a user-defined instance method calling from IRB

Question

class Object
  def all_equals(o)
    ops = [:==, :===, :eql?, :equal?]
    Hash[ops.map(&:to_s).zip(ops.map {|s| send(s, o) })]
  end
end

OUTPUT

"a".all_equals "a" # => {"=="=>true, "==="=>true, "eql?"=>true, "equal?"=>false}

Can anyone help me by breaking the code as much as deep can to see how it gave such output?

Just wanted to know the logic how it works to give some output

Thanks

Possible duplicate of: http://stackoverflow.com/questions/7156955/whats-the-difference-between-equal-eql-and — Diego Basch, Jan 12 '13 at 20:56
But how the internal logic goes on to reach the output can you tell me that? — Arup Rakshit, Jan 12 '13 at 20:58

score 3 · Accepted Answer · answered Jan 12 '13 at 21:12

self
# => "a"

o
# => "a"

ops.map(&:to_s)
# => [:==, :===, :eql?, :equal?].map(&:to_s)
# => ["==", "===", "eql?", "equal?"]

ops.map {|s| send(s, o) }
# => [:==, :===, :eql?, :equal?].map {|s| "a".send(s, "a") }
# => ["a".send(:==, "a"), "a".send(:===, "a"), "a".send(:eql?, "a"), "a".send(:equal?, "a")]
# => ["a" == "a", "a" === "a", "a".eql?("a"), "a".equal?("a")]
# => [true, true, true, false]

ops.map(&:to_s).zip(ops.map {|s| send(s, o) })
# => ["==", "===", "eql?", "equal?"].zip([true, true, true, false])
# => [["==", true], ["===", true], ["eql?", true], ["equal?", false]]

Hash[ops.map(&:to_s).zip(ops.map {|s| send(s, o) })]
# => Hash[[["==", true], ["===", true], ["eql?", true], ["equal?", false]]]
# => {"==" => true, "===" => true, "eql?" => true, "equal?" => false}

`+1` to you to show your interest and and explanation! that's the logic was running behind of the code! okay i understood! — Arup Rakshit, Jan 12 '13 at 21:17

Confusion with the output came from a user-defined instance method calling from IRB

1 Answers1