Parse dynamic as int or fallback to a default value
You can abstract the operation into a function like
int intOrStringValue(dynamic o) {
if (o is String) o = int.tryParse(o);
return o ?? 0;
}
or
int intOrStringValue(dynamic o) =>
(o is String ? int.tryParse(o) : o) ?? 0;
It gets more readable when you don't repeat the map['maxposts']
expression throughout the logic.
Magnus
I have delivered value. But at what cost? Bachelor of Science degree in Computer Engineering. ✪ Started out on ATARI ST BASIC in the 1980's, writing mostly "Look door, take key" type games. ✪ Spent a few years in high school writing various small programs for personal use in Delphi. ✪ Learned PHP/SQL/HTML/JS/CSS and played around with that for a few years. ✪ Did mostly Android and Java for a few years. ✪ Graduated from Sweden Mid University with a BSc in Computer Engineering. At this point, I had learned all there was to know about software development, except where to find that darn "any" key... ✪ Currently working with Flutter/Dart and Delphi (again).
Updated on December 09, 2022Comments
-
Magnus over 1 year
I have a map with dynamic values, one of which can be an
int
,string
ornull
(i.e. non-existing key).I want to store this value in an
int
variable. The parsing I came up with ended up being quite cumbersome:Map<String, dynamic> map = {'maxposts': null}; // or 23 or '42' // Try to parse an int value or fall back to 0 int maxposts = (map['maxposts'] is int) ? map['maxposts'] : int.tryParse(map['maxposts'] ?? '0') ?? 0;
Is there a nicer way of doing such a "try-fallback" parsing?
-
Günter Zöchbauer about 5 yearsI don't think there is.
-