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groovy

How to assign groovy function to a variable and call it?

I want to do something like this:

boolean flag = ...;
def foo(String x, String y) {
  // ...
}
def foo2(String x, String y) {
  // ...
}
def fun = flag ? foo : foo2;
fun("aaa", "bbb");

is something simillar possible?

Solution

  • You can use method pointers:

    def foo(String x, String y) {
   "FOO $x $y"
}
def foo2(String x, String y) {
   "FOO-TWOOO $x $y"
}

boolean flag = false
def fun = flag ? this.&foo : this.&foo2;
println fun("aaa", "bbb") // prints "FOO-TWOOO aaa bbb"

flag = true
fun = flag ? this.&foo : this.&foo2;
println fun("aaa", "bbb") // prints "FOO aaa bbb"

    With Groovy 3, you can do it the Java way too:

    def fun = flag ? this::foo : this::foo2;