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Number of Parameters

The number of parameters is the number of parameters received by a method (or function). If a method receive too many parameters, it is difficult to call and also difficult to change if it's called from many places.

Config example​

dart_code_metrics:
  ...
  metrics:
    ...
    number-of-parameters: 4
    ...

Example​

  MetricComputationResult<int> computeImplementation(
    Declaration node,
    Iterable<ScopedClassDeclaration> classDeclarations,
    Iterable<ScopedFunctionDeclaration> functionDeclarations,
    InternalResolvedUnitResult source,
  ) {
    int parametersCount;
    if (node is FunctionDeclaration) {
      parametersCount = node.functionExpression?.parameters?.parameters?.length;
    } else if (node is MethodDeclaration) {
      parametersCount = node?.parameters?.parameters?.length;
    }

    return MetricComputationResult(value: parametersCount ?? 0);
  }

Number of Parameters for the example function is 4.