Array#append does not exist in JRuby?

[azumakuniyuki]

NoMethodError: undefined method `append' for []:Array

[hiroyuki-sato]

JRuby itself supports append method.

java -jar jruby-complete-9.4.6.0.jar -S irb
irb(main):001:0> a = []
=> []
irb(main):002:0> a.append("a")
=> ["a"]

[azumakuniyuki]

@hiroyuki-sato Thank you for checking. However, at least JRuby 9.1 does not have Array#append as follows:

jruby 9.1.17.0 (2.3.3) 2018-04-20 d8b1ff9 Java HotSpot(TM) 64-Bit Server VM 11.0.5+10-LTS on 11.0.5+10-LTS +jit [darwin-x86_64]

irb(main):001:0> v = []
=> []
irb(main):002:0> v.append("neko")
NoMethodError: undefined method `append' for []:Array
	from (irb):2:in `<eval>'
	from org/jruby/RubyKernel.java:995:in `eval'
	from org/jruby/RubyKernel.java:1316:in `loop'
	from org/jruby/RubyKernel.java:1138:in `catch'
	from org/jruby/RubyKernel.java:1138:in `catch'
	from /usr/local/jr/bin/irb:13:in `<main>'

[hiroyuki-sato]

@azumakuniyuki

JRuby 9.1.x.x is compatible with Ruby 2.3. Array#append was introduced in MRI 2.5
https://docs.ruby-lang.org/en/3.2/NEWS/NEWS-2_5_0.html
https://bugs.ruby-lang.org/issues/12746

You can use push instead.

java -jar ~/.embulk/jars/jruby-complete-9.1.15.0.jar -S irb --readline
irb(main):001:0> JRUBY_VERSION
=> "9.1.15.0"
irb(main):002:0> RUBY_VERSION
=> "2.3.3"
irb(main):003:0> a = []
=> []
irb(main):004:0> a.push("a")
=> ["a"]

[azumakuniyuki]

@hiroyuki-sato Thank you for the announce of push method. I've decided that Sisimai 5 requires JRuby 9.2 or later because Sisimai 5 requires Ruby 2.4 or later.

irb(main):004:0> JRUBY_VERSION
=> "9.2.21.0"
irb(main):005:0> RUBY_VERSION
=> "2.5.8"
irb(main):006:0> p=[]; p.append("neko")
=> ["neko"]

[hiroyuki-sato]

I've decided that Sisimai 5 requires JRuby 9.2 or later because Sisimai 5 requires Ruby 2.4 or later.

Off topic. It seems that append was introduced in Ruby 2.5. Sisimai supports Ruby 2.4? (Maybe there is no Array#append method in Ruby 2.4)

[azumakuniyuki]

I thought I would use Array#append because I planned to use Ruby 2.6 or later in the early development of Sisimai 5, but after many years, I forgot everything and wrote 2.4...
Therefore, I will try to replace Array#append with Array#push today.

[hiroyuki-sato]

JFYI: And Ruby 2.7 already EOL
https://www.ruby-lang.org/ja/downloads/branches/

[azumakuniyuki]

!

[azumakuniyuki]

This issue resolved at v5.0.2