gstring

With the following snippet I cannot retrieve gString from a map: def contents = "contents" def gString = "$contents" def map = [(gString): true] assert map.size() == 1 // Passes assert gString.hashCode() == map.keySet().first().hashCode() // Passes, same hash code assert map[gString] // Fails How on earth is that possible? Assertion message clearly shows that there's something seriously wrong with Groovy: assert map[gString] // Fails | || | |contents | null [contents:true] It's not the same question as Why groovy does not see some values in dictionary? First answer there suggests: You're

While studying the Groovy (2.4.4) syntax in the official documentation, I came across the special behavior concerning maps with GStrings as identifiers. As described in the documentation, GStrings are a bad idea as (hash)map identifiers, because the hashcodes of a non-evaluated GString-object differs from a regular String-object with the same representation as the evaluated GString. Example: def key = "id" def m = ["${key}": "value for ${key}"] println "id".hashCode() // prints "3355" println "${key}".hashCode() // prints "3392", different hashcode assert m["id"] == null // evaluates true

According to the groovy docs , the == is just a 'clever' equals() as it also takes care of avoiding NullPointerException. So, the == and equals() should return the same value if the objects are not null. However, I'm getting unexpected results on executing the following script: println "${'test'}" == 'test' println "${'test'}".equals('test') The output that I'm getting is true false An example of this can be found here . Is this a known bug related to GStringImpl or something that I'm missing? Nice question, the surprising thing about the code above is that println "${'test'}".equals('test')