ruby_or_operator_evaluation.rb

## eager or
puts false | nil  # false
puts true | nil   # true
puts 2 == 2 | 2   # true
puts 2 == 2 | 3   # false, here 3 is consider as an int value, not a logical value

## lazy or
puts 2 == 2 || 3  # 3
puts 3 || 2 == 2  # true
puts 2 == 2 or 3  # 3
puts 3 or 2 == 2  # true

## evaluation of only one side
a = 2 || b = 3
puts "|| '#{ a }' '#{ b }'"  # || '2' ''
a = 2 or b = 3
puts "or '#{ a }' '#{ b }'"  # or '2' ''

## evaluation of both sides
a = false || b = 3
puts "|| '#{ a }' '#{ b }'"  # || '3' '3'
a = false or b = 3  
puts "or '#{ a }' '#{ b }'"  # or 'false' '3'

## a and b are both 3
a = (false || b = 3)
a = ( b = 3 )
a = 3