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to_i 

        # String.to_i

(from ruby core)
---
    to_i(base = 10) -> integer

---

Returns the result of interpreting leading characters in `self` as an
integer in the given `base` (which must be in (2..36)):

    '123456'.to_i     # => 123456
    '123def'.to_i(16) # => 1195503

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

    '12.345'.to_i   # => 12
    '12345'.to_i(2) # => 1

Returns zero if there is no leading valid number:

    'abcdef'.to_i # => 0
    '2'.to_i(2)   # => 0

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