What's difference?

[Kyung won Cheon]

--- test1.rb ---

b = 1
puts a if a = b

# NameError: undefined local variable or method `a' for main:Object


--- test2.rb ---

a = 1 if false
puts defined?(a)

# local-variable


###############
# Help Me^^
###############

 

[Mikael Høilund]

--- test1.rb ---

b =3D 1
puts a if a =3D b

# NameError: undefined local variable or method `a' for main:Object

Parser peculiarity. You can't use a local variable defined for the =20
first time in the clause of an inline-if for that statement. Define a =20=

before it reaches that line, or use this instead:

if a =3D b then puts a end

--=20
# Mikael H=F8ilund
def method_missing(m, a=3D0) a +
m.to_s[/[a-z]+/].size * 2; end
p What is the meaning of life?

 

[psy]

Hier from Programming Ruby book. Its not exactly for this case, but i think it gets close :