Closures

Groovy closures are true closures, with access to the variables in the context in which they are defined. They are:

• Contained in braces

• They are functions.

• Used in callbacks

• The default parameter (if you do not provide parameters) is it.

  [1,2,3].each {
     println it
  }

They can be used a lot like lambdas, passed as parameters to another function. (In other words, they are first-class objects.) But the Groovy documentation insists that they should not be thought of as lambdas.