How to add an element in array of Groovy

Code:

class GroovyController {

def index(){
println '-----------------------------------'
def originalArray = [1,2,3,4,5]
def element = 6
println 'Original array : '+originalArray
println 'After insertion of element : '+(originalArray << element)
render ''
}

}

Output:

Original array : [1, 2, 3, 4, 5]
After insertion of element : [1, 2, 3, 4, 5, 6]