Groovy: escape curly braces inside string

I am coding in groovy and am trying to return some javascript. Here is the issue I need to return a string that contains a curly brace and of course groovy reads that as an error. Here is a simple example:

${ i == 0 ? '{' : '}, {' }  

I want to return either:开发者_如何学运维

{ or

}, {

plan and simple.

${ i == 0 ? 'should be left brace' : "should be right brace coma left brace" }

Can curly braces be escaped, similar to escaping quotes?

I have tried:

${ i == 0 ? '\{' : '\}, \{' }    

and

${ i == 0 ? '{{' : '}}, {{' }

Thanks.

I assume that problem occurs in a GSP page. The error you probably get should look similar to this one:

expecting ''', found '\n' @ line 57, column 80.
it) { return i == 0 ? '{' : ' })

One solution is to use the Unicode representation for left and right curly braces:

${ i == 0 ? "\u007B" : "\u007D,\u007B" }

This works for me:

def i = 1
assert "},{" == "${i == 0 ? '{' : '},{'}"