Janus time-reversible computing programming language is a historical programming language created in 1982. Janus is a time-reversible programming language written at Caltech in 1982. The operational semantics of the language were formally specified, together with a program inverter and an invertible self-interpreter, in 2007 by Tetsuo Yokoyama and Robert Gl├╝ck. A Janus inverter and interpreter is made freely available by the TOPPS research group at DIKU. Read more on Wikipedia...

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Example code from Wikipedia:

procedure fib
    from  i = 2
        i += 1
        x1 <=> x2
        x1 -= x2
    until i = n

Last updated October 14th, 2019