toInt method
Parses the string as an int number and returns the result.
The radix
must be in the range 2..36. The digits used are
first the decimal digits 0..9, and then the letters 'a'..'z' with
values 10 through 35. Also accepts upper-case letters with the same
values as the lower-case ones.
If no radix
is given then it defaults to 10.
Implementation
int toInt({int? radix}) => int.parse(this, radix: radix);