var str1: String = "Hello"
println("方法一：-------------")
var first_str :String= str1.take(1)
var last_str :String= str1.reverse.take(1)
println("first_str:"+first_str)
println("last_str:"+last_str)
println("方法二：-------------")
println("first_str:"+str1.head)
println("last_str:"+str1.last)
Processed:
0.018, SQL:
10
