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String#start_with? returns false when using an empty string #1923

YorickPeterse opened this Issue Aug 26, 2014 · 3 comments


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YorickPeterse commented Aug 26, 2014

On MRI/Rubinius the following returns true:


On JRuby 1.7.12 however this returns false. I've created a corresponding RubySpec pull request to at least add a spec for this, which can be found here:

Currently some of my code relies on this behavior, though one can quite easily work around it (at least for the time being).

YorickPeterse added a commit to YorickPeterse/oga that referenced this issue Aug 26, 2014

Work around JRuby issue #1923.
String#start_with?() returns false on JRuby when used with an empty string. See
jruby/jruby#1923 for more information.

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subbuss commented Aug 27, 2014

FWIW, this works in 9K (jruby-head).

$ jruby -e "p 'hello'.start_with?('')"

@enebo enebo added this to the JRuby 1.7.14 milestone Aug 27, 2014


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enebo commented Aug 27, 2014

This works on jruby-1_7 branch (and will be in 1.7.14). I did not bother to check if this was fixed for 1.7.13 or for 1.7.14 but it can be marked back as fixed to 1.7.13 if anyone cares enough to figure that detail out.

@enebo enebo closed this Aug 27, 2014


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YorickPeterse commented Aug 27, 2014

Ah great, thanks!

@enebo enebo modified the milestones: JRuby 1.7.14, JRuby 1.7.15 Aug 27, 2014

mkristian added a commit that referenced this issue Aug 28, 2014

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