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avoid-unused-assignment

added in: 1.22.0
warning
Pro+
preset: recommended

Warns when an assignment is not used in the subsequent statements.

Example​

❌ Bad:

void fn1() {
  var v = 'used';
  doSomething(v);
  v = 'unused'; // LINT: This assigned value is not used in subsequent statements. Try removing this assignment.
}

void fn2(bool condition) {
  var v = 'used';
  if (condition) {
    v = 'unused'; // LINT: This assigned value is not used in subsequent statements. Try removing this assignment.
    return;
  }
  doSomething(v);
}

✅ Good:

void fn1() {
  var v = 'used';
  doSomething(v);
}

void fn2(bool condition) {
  var v = 'used';
  if (condition) {
    return;
  }
  doSomething(v);
}

Additional Resources​