How to express infinity in Ruby?

Is there a keyword to express Infinity in Ruby?

3 Answers

If you use ruby 1.9.2, you can use:

>> Float::INFINITY #=> Infinity >> 3 < Float::INFINITY #=> true 

Or you can create your own constant using the following*:
I've checked that in Ruby 1.8.6, 1.8.7, and 1.9.2 you have Float.infinite?.

PositiveInfinity = +1.0/0.0 => Infinity NegativeInfinity = -1.0/0.0 => -Infinity CompleteInfinity = NegativeInfinity..PositiveInfinity => -Infinity..Infinity 

^{*I've verified this in Ruby 1.8.6 and 1.9.2}

No keyword, but 1.9.2 has a constant for this:

>> Float::INFINITY #=> Infinity >> 3 < Float::INFINITY #=> true 

Consider BigDecimal in the ruby docs

1.9.3p429 :025 > BigDecimal('Infinity') => #<BigDecimal:7f8a6c548140,'Infinity',9(9)> 1.9.3p429 :026 > BigDecimal('-Infinity') => #<BigDecimal:7f8a6a0e3728,'-Infinity',9(9)> 1.9.3p429 :027 > 3 < BigDecimal('Infinity') => true 1.9.3p429 :028 > BigDecimal::INFINITY => #<BigDecimal:7f8a6ad046d8,'Infinity',9(9)>