在Groovy闭包中逗号是什么意思？

Question

I found the following expression:

 { i -> module BookRow, $("table#book-results tbody tr", i) }

in Modelling repeating structures with Geb page objects article .

Answer 1

Inside this Groovy closure, you have a call to a module method that takes two arguments: BookRow and $("table#book-results tbody tr", i) . Groovy actually allows to omit parentheses for top-level statements, and here, the comma separator actually separates the two arguments of this module method call.

ie. foo a, b is equivalent to foo(a, b) .

If you wanted to separate two statements on the same line, you'd use semi-colons: foo(); bar() foo(); bar() .