There are two aspects to this, the trigraph, and using the short circuiting behaviour of the binary logic operator for control flow. The latter is a very commo

There are two aspects to this, the trigraph, and using the short circuiting behaviour of the binary logic operator for control flow. The latter is a very common idiom in Julia code, which I found obscure and puerile at first (“look how smart I am”), but have come to appreciate as concise and natural by now. For example: function fact(n::Int) n >= 0 || error("n must be non-negative") n == 0 && return 1 n * fact(n-1) end https://docs.julialang.org/en/v1/manual/control-flow/#Short-Circuit-Evaluation https://docs.julialang.org/en/v1/manual/control-flow/#Short-...