How Ruby interpreter works

gistfile1.sh

irb(main):014:0> if 1==2
irb(main):015:1>  print "True"
irb(main):016:1> ense
irb(main):017:1>  print "False"
irb(main):018:1> end
=> nil

# Why nil? 

# No answer? Hint: Let's look at different cases

irb(main):001:0> ense
NameError: undefined local variable or method `ense' for main:Object
	from (irb):1
	from /usr/local/bin/irb:12:in `<main>'
irb(main):002:0> if 1==1
irb(main):003:1>   ense
irb(main):004:1> end
NameError: undefined local variable or method `ense' for main:Object
	from (irb):3
	from /usr/local/bin/irb:12:in `<main>'
irb(main):005:0> if 1==1
irb(main):006:1>  print "True"
irb(main):007:1>  ense
irb(main):008:1> end
TrueNameError: undefined local variable or method `ense' for main:Object
	from (irb):7
	from /usr/local/bin/irb:12:in `<main>'
irb(main):009:0> if 1==1
irb(main):010:1>  print "True"
irb(main):011:1> ense
irb(main):012:1>  print "False"
irb(main):013:1> end
TrueNameError: undefined local variable or method `ense' for main:Object
	from (irb):11
	from /usr/local/bin/irb:12:in `<main>'
irb(main):014:0> if 1==2
irb(main):015:1>  print "True"
irb(main):016:1> ense
irb(main):017:1>  print "False"
irb(main):018:1> end
=> nil