Julia !(a::Int) = !bool(a) !0 + 2 + 2 ##> 5 | Hacker News

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runarberg on June 1, 2014 | parent | context | favorite | on: Write a program that makes 2 + 2 = 5

Julia

  !(a::Int) = !bool(a)
  !0 + 2 + 2

  ##> 5

orangecat on June 1, 2014 [–]

Or more directly:

  julia> +(a::Int, b::Int) = if a==b==2 5 else a-(-b) end
  julia> 2+2
  5
  julia> 3+1
  4

(The else part can't use + or it will cause infinite recursion).

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