Parses source
as a, possibly signed, integer literal and returns its value.
As parse except that this method returns null
if the input is not valid
external static BigInt tryParse(String source, {int radix});
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-core/BigInt/tryParse.html