string - GString performance

Question

If I need plain string in Groovy, does using double-quoted literals make any influence on performance?

For instance:

def plainString = 'Custom string'
def gString = "Custom string"

In my understanding, plain String should be faster because during runtime there are no searches for specific characters and substitutions.

Answer 1

来自Groovy 语言规范：

java.lang.String如果没有插值表达式，双引号字符串是普通的，但groovy.lang.GString如果存在插值，则为实例。

因此，请随意使用双引号或单引号：它们将产生相同类型的对象。不同之处$在于双引号字符串中有 a 。但到那时，我们谈论的是语义，而不是性能。