Return outer function in do block

[Tamas_Papp]

I occasionally miss common-lisp:return-from in Julia, which has no such construct AFAIK.

A version of map, mapreduce & friends (foldl etc) that allow early termination (eg based on a sentinel value or a flag that is returned) could help in cases like this, and there is no reason a package could not implement these efficiently (maybe there is one already, I just missed it). Cf

Terminating sum early

I am calculating a sum of values returned by a function, which is supposed to be type stable. The function may be costly, and returns values that are either finite or -Inf. In case of -Inf, I would like to return early. MWE (which is of course not costly, the first version does not return early): observation_logdensity(μ, x) = x > μ ? -abs2(x - μ) : oftype(promote(x, μ), -Inf) sample_logdensity1(μ, xs) = sum(observation_logdensity(μ, x) for x in xs) Now I am wondering how to program what I w…