Ruby Language Numbers Converting a String to Integer
Example
You can use the Integer method to convert a String to an Integer:
Integer("123") # => 123
Integer("0xFF") # => 255
Integer("0b100") # => 4
Integer("0555") # => 365
You can also pass a base parameter to the Integer method to convert numbers from a certain base
Integer('10', 5) # => 5
Integer('74', 8) # => 60
Integer('NUM', 36) # => 30910
Note that the method raises an ArgumentError if the parameter cannot be converted:
Integer("hello")
# raises ArgumentError: invalid value for Integer(): "hello"
Integer("23-hello")
# raises ArgumentError: invalid value for Integer(): "23-hello"
You can also use the String#to_i method. However, this method is slightly more permissive and has a different behavior than Integer:
"23".to_i # => 23
"23-hello".to_i # => 23
"hello".to_i # => 0
String#to_i accepts an argument, the base to interpret the number as:
"10".to_i(2) # => 2
"10".to_i(3) # => 3
"A".to_i(16) # => 10
