prefer_contains
Use contains for List
and String
instances.
This rule is available as of Dart 2.0.
Rule sets: recommended, flutter
This rule has a quick fix available.
Details
#DON'T use indexOf
to see if a collection contains an element.
Calling indexOf
to see if a collection contains something is difficult to read and may have poor performance.
Instead, prefer contains
.
BAD:
if (lunchBox.indexOf('sandwich') == -1) return 'so hungry...';
GOOD:
if (!lunchBox.contains('sandwich')) return 'so hungry...';
Usage
#To enable the prefer_contains
rule, add prefer_contains
under linter > rules in your analysis_options.yaml
file:
linter:
rules:
- prefer_contains
Unless stated otherwise, the documentation on this site reflects Dart 3.5.3. Page last updated on 2024-07-03. View source or report an issue.