String concat Groovy

bench-string-concat.groovy

@Grab(group='org.gperfutils', module='gbench', version='0.4.3-groovy-2.4')

String a = 'The quick brown fox'
String b = 'jumps over the lazy dog'
int x = 1
double y = 2

benchmark {
      'simple concat' {
          String concat = a + ' ' + b + ' ' + x + ' ' + y
      }
      'gstring' {
          String concat = "$a $b $x $y"
      }
      'gstring (closures)' {
         String concat = "${-> a} ${-> b} ${-> x} ${-> y}"
      }
      'StringBuilder' {
         String concat = new StringBuilder()
            .append(a).append(' ').append(b).append(' ').append(x).append(' ').append(y)
      }
}.prettyPrint()

Shows:

Environment
===========
* Groovy: 2.4.7
* JVM: Java HotSpot(TM) 64-Bit Server VM (25.91-b14, Oracle Corporation)
    * JRE: 1.8.0_91
    * Total Memory: 240 MB
    * Maximum Memory: 3545 MB
* OS: Linux (4.4.0-72-generic, amd64)

Options
=======
* Warm Up: Auto (- 60 sec)
* CPU Time Measurement: On

                    user  system   cpu  real

simple concat        730       9   739   739
gstring              564      12   576   576
gstring (closures)  1076       9  1085  1085
StringBuilder        218       3   221   221