The output of this code is `2, 2, 4`. When `logValues(2)` is called, the parameter `a` gets the value 2. Since no values are provided for `b` and `c`, their default values are used. The default value for `b` is `a`, which is now 2. The default value for `c` is `a + b`, which is 2 + 2 = 4. This example demonstrates the chaining of default parameters, where each parameter can reference previously defined parameters in its default expression. This creates a cascading effect where changing the value of an earlier parameter affects the defaults of later parameters. This feature allows you to maintain relationships between parameters and create more dynamic function interfaces. The parameters are processed from left to right during function invocation, ensuring that each default expression has access to all previously defined parameter values.