Groovy: List in boolean context

Empty list evaluate to false, and non-empty list evaluates to true.

HelloWorld.groovy

emptyList = []
nonEmptyList = [null]

if(emptyList){
 println "emptyList evaluated to true"
}else{
 println "emptyList evaluated to false"
}

if(nonEmptyList){
 println "nonEmptyList evaluated to true"
}else{
 println "nonEmptyList evaluated to false"
}

Output

emptyList evaluated to false

nonEmptyList evaluated to true

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