prefer_final_locals
Prefer final for variable declarations if they are not reassigned.
This rule is available as of Dart 2.0.
This rule has a quick fix available.
Incompatible rules: unnecessary_final
Details
#DO prefer declaring variables as final if they are not reassigned later in the code.
Declaring variables as final when possible is a good practice because it helps avoid accidental reassignments and allows the compiler to do optimizations.
BAD:
void badMethod() {
var label = 'hola mundo! badMethod'; // LINT
print(label);
}
GOOD:
void goodMethod() {
final label = 'hola mundo! goodMethod';
print(label);
}
GOOD:
void mutableCase() {
var label = 'hola mundo! mutableCase';
print(label);
label = 'hello world';
print(label);
}
Usage
#To enable the prefer_final_locals
rule, add prefer_final_locals
under linter > rules in your analysis_options.yaml
file:
linter:
rules:
- prefer_final_locals
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.