[jira] [Updated] (GROOVY-4018) Make the Groovy truth value of NaN be false

["Steve Tekell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-4018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Tekell updated GROOVY-4018:
---------------------------------
    Description: 
Similar to null and empty-string, have Groovy evaluate NaN as false rather than true.

def x = a?.b?.calcX(...)
if (x) {
  // now I have a valid non-null number
}


This is how JavaScript treats NaN and like other Groovy design choices, it just makes sense.

Discussed in this thread
http://old.nabble.com/Shouldn't-the-Groovy-truth-value-of-NaN-be-false--tt27348256.html

That is, if NaN was false the follow should work


assert !(Double.NaN)

assert !((Double.NaN as Boolean) == true)

assert ((Double.NaN as Boolean) == false)


  was:
Similar to null and empty-string, have Groovy evaluate NaN as false rather than true.

def x = a?.b?.calcX(...)
if (x) {
  // now I have a valid non-null number
}


This is how JavaScript treats NaN and like other Groovy design choices, it just makes sense.

Discussed in this thread
http://old.nabble.com/Shouldn't-the-Groovy-truth-value-of-NaN-be-false--tt27348256.html



> Make the Groovy truth value of NaN be false
> -------------------------------------------
>
>                 Key: GROOVY-4018
>                 URL: https://issues.apache.org/jira/browse/GROOVY-4018
>             Project: Groovy
>          Issue Type: Improvement
>          Components: groovy-runtime
>            Reporter: Steve Tekell
>
> Similar to null and empty-string, have Groovy evaluate NaN as false rather than true.
> def x = a?.b?.calcX(...)
> if (x) {
>   // now I have a valid non-null number
> }
> This is how JavaScript treats NaN and like other Groovy design choices, it just makes sense.
> Discussed in this thread
> http://old.nabble.com/Shouldn't-the-Groovy-truth-value-of-NaN-be-false--tt27348256.html
> That is, if NaN was false the follow should work
> assert !(Double.NaN)
> assert !((Double.NaN as Boolean) == true)
> assert ((Double.NaN as Boolean) == false)



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