creating a <=> method

[Dirk Meijer]

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hi everyone,
i've created a class, and want it to be comparable with itself, but i don't
know what to place inside the <=3D> method.
the basic idea is that one of the values of the class (which is a symbol) i=
s
converted to a string, which is then compared.
greetings, Dirk.

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[James Edward Gray II]

hi everyone,
i've created a class, and want it to be comparable with itself, but
i don't
know what to place inside the <=> method.
the basic idea is that one of the values of the class (which is a
symbol) is
converted to a string, which is then compared.

Like this?

def <=>( other )
sym.to_s <=> other.sym.to_s
end

James Edward Gray II

 

[gabriele renzi]

Dirk Meijer ha scritto:

hi everyone,
i've created a class, and want it to be comparable with itself, but i don't
know what to place inside the <=> method.
the basic idea is that one of the values of the class (which is a symbol) is
converted to a string, which is then compared.
greetings, Dirk.

yuu should return 1 if self > b, 0 if self == b and -1 otherwise.
=> false

hope this helps

 

[Dirk Meijer]

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Like this?

def <=3D>( other )
sym.to_s <=3D> other.sym.to_s
end

James Edward Gray II

it works, thanks!
didn't think it would be that simple..
greetings, Dirk.

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[Eero Saynatkari]

hi everyone,
i've created a class, and want it to be comparable with itself, but i
don't
know what to place inside the <=> method.
the basic idea is that one of the values of the class (which is a
symbol) is
converted to a string, which is then compared.

# The spaceship operator needs to return either
# -1, 0 or 1 depending on whether it is 'smaller',
# 'equal' or 'greater' than the other object.
def <=>(other)
# We can use String#<=> here if both are Strings.
# Otherwise implement some custom comparison as above.
@my_value.to_s <=> other.to_s
end

greetings, Dirk.

E