Equality in Ruby - == eql? and equal?

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The == comparison checks whether two values are equal

eql? checks if two values are equal and of the same type

equal? checks if two things are one and the same object.

How do I remember which is which ... The longer the operator, the more restrictive the test it performs

Example:

irb(main):013:0> val = 17

=> 17

irb(main):014:0> val == 17.0

=> true

irb(main):015:0> val.eql?(17.0)

=> false

irb(main):016:0> val.eql?(17)

=> true

irb(main):017:0> val.equal?(17)

=> true

(written 2006-12-14)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

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  [3159] Returning multiple values from a function call in various languages - a comparison - (2011-02-06)
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  [3253] Is this number between? Does this list include? - Ruby - (2011-04-18)
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  [3769] Muttable v immutable and implications - Ruby - (2012-06-20)
  [4322] Learning to Program - the conditional statement (if) - (2014-11-21)
  [4323] Learning to program - Loop statements such as while - (2014-11-22)
  [4370] Conditionals, loops and methods in Ruby - a primer with simple examples - (2014-12-29)
  [4402] Finding sum, minimum, maximum and average in Python (and Ruby) - (2015-01-19)
  [4503] Separating your code for easier testing, understanding and re-use; example in Ruby - (2015-06-02)
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)
  [4674] Alternating valuses / flip-flop / toggle - example in Ruby - (2016-05-17)

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Some other Articles

Melksham Quiz
You should think you're first in a hotel room
Ruby v Perl - interpollating variables
puts - opposite of chomp in Ruby
Equality in Ruby - == eql? and equal?
Cardinal numbers and magic numbers
Blessing in Perl / Member variable in Ruby
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Finalist reception - Wiltshire Business of the Year
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