[dubbel]

I don't know any language that offers this, I just wanted to say that I have also thought about this feature at times - but when reading your pseudocode I didn't initially get it, because of the OR, which already has its meaning - instead one could use "either", like "either(a, b, c).either(beginswith, endswith)...".

[aragonite]

Thanks! I just fixed the pseudocode. Indeed `either ... or` seems almost obligatory for clarity purposes in this type of context.