Ruby: Continue a loop after catching an exception

Question

Basically, I want to do something like this (in Python, or similar imperative languages):

for i in xrange(1, 5):
    try:
        do_something_that_might_raise_exceptions(i)
    except:
        continue    # continue the loop at i = i + 1

How do I do this in Ruby? I know there are the redo and retry keywords, but they seem to re-execute the "try" block, instead of continuing the loop:

for i in 1..5
    begin
        do_something_that_might_raise_exceptions(i)
    rescue
        retry    # do_something_* again, with same i
    end
end

C. K. Young · Accepted Answer · 2016-11-15T18:08:33.020

142

In Ruby, continue is spelt next.

edited Nov 15 '16 at 18:08

answered Apr 12 '10 at 19:39

C. K. Young

219,335
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10

@Thayne [British spelling](https://en.wiktionary.org/wiki/spelt#Etymology_1) isn't misspelling! The world does not revolve around the US. :-) (Don't feel bad. I revert Americanisation edits all the time.) – C. K. Young Nov 15 '16 at 18:08
5

I appologize, I didn't reallize spelt was a valid spelling in british english. – Thayne Nov 16 '16 at 19:28

score 65 · Answer 2 · answered Nov 11 '10 at 13:38

65

for i in 1..5
    begin
        do_something_that_might_raise_exceptions(i)
    rescue
        next    # do_something_* again, with the next i
    end
end

answered Nov 11 '10 at 13:38

Carlo

651
5
2

could you also suggest a way to output the exception that took place. – whizcreed Dec 29 '11 at 15:23
1

rescue => e e contains exception object, you could e.message, e.backtrace – user1136228 Apr 14 '16 at 08:52
4

You're in a loop, after the rescue, it will continue with the loop, whether there is a `next` or not in `rescue`. – Paul Verschoor Oct 13 '21 at 10:07

score 9 · Answer 3 · answered Jan 23 '13 at 03:51

9

to print the exception:

rescue
        puts $!, $@
        next    # do_something_* again, with the next i
end

answered Jan 23 '13 at 03:51

Konstantin

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Ruby: Continue a loop after catching an exception

3 Answers3