IRB now supports type based completion with ruby/repl_type_completor.
See IRB's README for more information.
KatakataIrb might provide a better autocompletion based on type analysis to irb.
gem install katakata_irb
Just require katakata_irb or write it to your .irbrc file.
# .irbrc
require 'katakata_irb' rescue nilirb(main):001:0> require 'katakata_irb'
=> true
irb(main):002:0> [1,'a'].sample.a█
|[1,'a'].sample.abs |
|[1,'a'].sample.abs2 |
|[1,'a'].sample.allbits? |
|[1,'a'].sample.angle |
|[1,'a'].sample.anybits? |
|[1,'a'].sample.arg |
|[1,'a'].sample.ascii_only?|
irb(main):001:0> require 'katakata_irb'
=> true
irb(main):002:0> a = 10
=> 10
irb(main):003:1* if true
irb(main):004:2* b = a.times.map do
irb(main):005:2* _1.to_s
irb(main):006:1* end
irb(main):007:1* b[0].a█
|b[0].ascii_only?|