toIntOrNull method
Parses the string as an int number and returns the result or null
if
the string is not a valid representation of a number.
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? toIntOrNull({int? radix}) => int.tryParse(this, radix: radix);