编辑代码

//JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。
println("Hello world!     -  groovy.jsrun.net")

def xxxx(a,b){
if(!a&&!b){
return []
}
if(!a){
return b.unique() as List
}
if(!b){
return a.unique() as List
}
return (a + b).unique() as List

}


Set s1=['a','b']
Set s2=['a','c']
print(xxxx(s1,s2))

Set s3=['a','b']
def s4=['a','c']
print(xxxx(s3,s4))

def s5=['a','b']
def s6=['a','c']
print(xxxx(s5,s6))