//?8-3?結尾閉包（traling?closure）和?捕獲數值（Capture?Values）

import?UIKit

var?strArr?=?["d","cd","bcd","abcd","abc","ab","a"]

sorted(strArr,{(s1,s2)?in
????if?countElements(s1)?!=?countElements(s2)
????{
????????return?countElements(s1)?<?countElements(s2)
????}
????return?s1?<?s2
})

//trailing?closure
sorted(strArr){(s1,s2)?in
????if?countElements(s1)?!=?countElements(s2)
????{
????return?countElements(s1)?<?countElements(s2)
????}
????return?s1?<?s2
}