Lack of `continue`

[CasperVector]

return and break have been reintroduced into this neat rc implementation. May I request to also add continue? This can be really helpful for some constructs.

[TobyGoodwin]

Thanks for the input. Do you have a short yet compelling example? :smile:

Offhand, it looks to me like

while (condition) {
    ... stuff ...
    if (something)
        continue;
    .... more stuff ..
}

can always be replaced by

while (condition) {
    ... stuff ...
    if (!something) {
        ... more stuff ...
    }
}

[CasperVector]

loop {
    stuff1 ...
    cond1 || continue
    stuff2 ...
    cond2 || continue
    ...
}

(Similar constructs also occur with return and break :)

[borkovic]

Two reasons I'd vote to add continue:

• From Tom Duff's paper: "Where Bourne's syntax draws from Algol 68, rc's is based on C or Awk."
• It is true that both break and continue can be replaced by ifs(); but continue can help reduce excessive indentation.

I have an implementation of continue in my repository. If there is a consensus for adding it, I'd be glad to post it for a pull.

[TobyGoodwin]

@borkovic I'd be very interested to see your implementaton. Can you turn it into a pull request?

[borkovic]

I am out of town. I'll try to do it over the weekend.

On Fri, Aug 25, 2017 at 12:44 PM Toby Goodwin notifications@github.com wrote:

@borkovic https://github.com/borkovic I'd be very interested to see your implementaton. Can you turn it into a pull request?

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[TobyGoodwin]

Thanks, looks great! (I particularly like the new assert() in unexcept()) I've pushed a branch called continue to the main github repo, in case other people want to play with it. I'll merge this into master in the next few days unless anyone objects.

[borkovic]

Glad to contribute.

Interesting that you like assert() in unexcept(): I was not sure whether to make 'continue' change alone or to include assert()+unexcept() as well.

On Mon, Aug 28, 2017 at 12:51 PM, Toby Goodwin notifications@github.com wrote:

Thanks, looks great! (I particularly like the new assert() in unexcept()) I've pushed a branch called continue to the main github repo, in case other people want to play with it. I'll merge this into master in the next few days unless anyone objects.

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[TobyGoodwin]

merged