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finite? 

        # Float.finite?

(from ruby core)
---
    finite? -> true or false

---

Returns `true` if `self` is not `Infinity`, `-Infinity`, or `Nan`,
`false` otherwise:

    f = 2.0      # => 2.0
    f.finite?    # => true
    f = 1.0/0.0  # => Infinity
    f.finite?    # => false
    f = -1.0/0.0 # => -Infinity
    f.finite?    # => false
    f = 0.0/0.0  # => NaN
    f.finite?    # => false

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