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avoid-unnecessary-reassignment

added in: 1.8.0
warning
Pro+
preset: recommended

Warns when a value is reassigned to a variable without using the initial value.

Example​

❌ Bad:

String alpha = '';
if (something) {
  alpha = 'true value'; // LINT: Avoid unnecessary reassignment. Try moving this assignment to the initial variable declaration.
} else {
  alpha = 'false value'; // LINT: Avoid unnecessary reassignment. Try moving this assignment to the initial variable declaration.
}

String beta = '';
beta = something ? 'true value' : 'false value'; // LINT: Avoid unnecessary reassignment. Try moving this assignment to the initial variable declaration.

SomeObject object = SomeObject();
object = something ? SomeObject() : SomeObject(); // LINT: Avoid unnecessary reassignment. Try moving this assignment to the initial variable declaration.

✅ Good:

final alpha = something ? 'true value' : 'false value';
final beta = something ? 'true value' : 'false value';
final object = SomeObject();

Additional Resources​