This page contains a Javascript interpreter for the esoteric programming language Qdeql. Qdeql was designed by an American programmer known as ‘Graue’, who wanted to show that a language with a single queue as its only storage mechanism can be Turing-complete — unfortunately, Qdeql isn’t. The specification does not define the behaviour of unknown instructions, and this interpreter ignores unknown instructions. The example code inputs a character and then outputs it again.