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to_f 

        # String.to_f

(from ruby core)
---
    to_f -> float

---

Returns the result of interpreting leading characters in `self` as a
Float:

    '3.14159'.to_f  # => 3.14159
    '1.234e-2'.to_f # => 0.01234

Characters past a leading valid number (in the given `base`) are
ignored:

    '3.14 (pi to two places)'.to_f # => 3.14

Returns zero if there is no leading valid number:

    'abcdef'.to_f # => 0.0

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