Method parameters in Groovy

  Groovy allows you to create a methods with optional parameter, but the trailing parameter is only optional, see the below example.

class MathLog {
 def log(x,base=10) {
  Math.log(x)/Math.log(base)
 }
}

 Here the base is optional parameter.

The main method.

MathLog mathLog = new MathLog()

println mathLog.log(10)

println mathLog.log(10,2)

 The function call  mathLog.log(10) takes the base value as 10, that's defined in the method itself but the function call mathLog.log(10,2) takes the 2 as a base value.

The output is
1.0
3.3219280948873626

Note:  In Groovy the return statement is optional, because by default it's return the last line output to calling method.