avoid-declaring-call-method

added in: 1.3.0

warning

🛠

Warns when a class has a call method.

Dart has a concept of callable classes, meaning that you can invoke a class instance (if a class has a call method) like if you'd invoke a regular function / method. While this feature might be convenient for some use-cases, this behavior is implicit and might lead to unexpected results or overcomplicated code.

Additional resources:

• https://gist.github.com/ilikerobots/df1fec65cf0b91a1dfa2f94dc4e43680

Example

❌ Bad:

class WannabeFunction {
  String call(String a, String b, String c) => '$a $b $c!'; // LINT
}

var wf = WannabeFunction();
var out = wf('Hi', 'there,', 'gang');

✅ Good:

class WannabeFunction {
  String calculate(String a, String b, String c) => '$a $b $c!';
}

var wf = WannabeFunction();
var out = wf.calculate('Hi', 'there,', 'gang');