I think more languages should have `unless`. I have seen lots of code like `if !(this || that)` that would be easier to read with `unless`. Sometimes `if !this && !this` is clear enough but I frequently find that I am decided between two mediocre options. I think the clarity of `unless`outweighs the benefit of another keyword, especially when it is so similar to `if`.

@kevincox People hated Perl because it told them the truth.

Waiting for BASIC's REPEAT...UNTIL to return. It's the inverse of do {} while!

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@LionsPhil I'm also in favour of until loops. However with most modern languages supporting a for-each construct I don't need it as much as until.

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