Build scripts are Groovy code

We must keep in mind that Gradle scripts use Groovy. This means that we can use all the Groovy's good stuff in our scripts. We already saw the use of so-called Groovy GString in our sample script. The GString object is defined as a String with double quotes and can contain references to variables defined in a ${... } section. The variable reference is resolved when we get the value of the GString.

However, other great Groovy constructs can also be used in Gradle scripts. The following sample script shows some of these constructs:

task numbers << { 
    // To define a range of numbers 
    // we can use the following syntax: 
    // start..end. 
    // The each method executes the code 
    // in the closure for each element 
    // in a collection, like a range. 
    (1..4).each { number -> 
        // def is short for define. 
        // Used to define a variable without 
        // an explicit type of the variable. 
        def squared = number * number...