Operator precedence for And/&& in Ruby [duplicate]

by

I don’t quite understand the question you are asking. I mean, you have already given the answer yourself, before even asking the question: && binds tighter than = while and binds less tightly than =.

So, in the first case, the expression is evaluated as follows:

( a=f(2) )  and  ( b=f(4) )
( a=  2  )  and  ( b=f(4) )
      2     and  ( b=f(4) ) # a=2
      2     and  ( b=  4  ) # a=2
      2     and        4    # a=2; b=4
                       4    # a=2; b=4

In the second case, the evaluation is as follows:

a   =   (  f(2) && ( b=f(4) )  )
a   =   (    2  && ( b=f(4) )  )
a   =   (    2  && ( b=  4  )  )
a   =   (    2  &&       4     ) # b=4
a   =                    4       # b=4
                         4       # b=4; a=4

More Related Contents:

  1. Reassigning the value of variables in Ruby?
  2. What is attr_accessor in Ruby?
  3. Ruby: String Comparison Issues
  4. Ruby 2.0.0p0 IRB warning: “DL is deprecated, please use Fiddle”
  5. How to get the name of the calling method?
  6. Why is `a = a` `nil` in Ruby?
  7. What exactly is `&:capitalize` in Ruby?
  8. Ruby’s File.open and the need for f.close
  9. Difference between map and collect in Ruby?
  10. What does __FILE__ mean in Ruby?
  11. How to check whether a string contains a substring in Ruby
  12. Why are my basic Heroku apps taking two seconds to load?
  13. obj.nil? vs. obj == nil
  14. Find key/value pairs deep inside a hash containing an arbitrary number of nested hashes and arrays
  15. Set global default encoding for ruby 1.9
  16. Learning Insertion Sort in Ruby
  17. Can’t install RMagick 2.13.1. Can’t find MagickWand.h.
  18. gem eventmachine fatal error: ‘openssl/ssl.h’ file not found
  19. Is there an inverse ‘member?’ method in ruby?
  20. Passing a method as a parameter in Ruby
  21. In Ruby, is there an Array method that combines ‘select’ and ‘map’?
  22. What does “
  23. Interpolating a string into a regex
  24. Better ruby markdown interpreter?
  25. Overriding method by another defined in module
  26. Ruby gem for finding timezone of location [closed]
  27. Is it possible to have class.property = x return something other than x?
  28. Ruby local variable is undefined
  29. Understanding Ruby and OS I/O buffering
  30. Rake “already initialized constant WFKV_” warning

Leave a Comment