Difference from CRuby

Features missing

• defined? operator
  • Workaround: can be replaced with Module.const_defined? etc.
  • https://github.com/mruby/mruby/issues/1696
• Bignum
  • no Bignum class
  • a Fixnum value cannot be smaller than MRB_INT_MIN nor larger than MRB_INT_MAX.
  • Wordaround: none, or use Float if you don't need exact numbers
• A lot of standard libraries
  • Wordaround: try mrbgems
  • There is a list of known mrbgems: https://github.com/mruby/mruby/wiki/Related-Projects
  • Or managemengt tool written in Ruby: https://github.com/bovi/mgem-list

Different behavior

• Integer#/ always returns a Float value
  • CRuby returns an Integer value (with rounding)
  • Wordaround: appy Float#round or other rounding methods
  • https://github.com/mruby/mruby/issues/1431