在scala中使用数组参数格式化字符串

Question

I have next list and string:

val s = List(JSONObject, JSONObject, JSONObject)
val data = s"""[${s(0)}, ${s(1)}, ${s(2)}]"""

Is it possible to pass list to s function, so I won't get list elements by index?

Answer 1

You're looking for mkString :

List(
  JSONObject(Map("hello" -> "world", "stackoverflow" -> "ishere")),
  JSONObject(Map("1" -> 1))
).map(_.toString()).mkString(", ")

Yields:

scala> :pa
// Entering paste mode (ctrl-D to finish)

List(
  JSONObject(Map("hello" -> "world", "stackoverflow" -> "ishere")),
  JSONObject(Map("1" -> 1))
).map(_.toString()).mkString(", ")

// Exiting paste mode, now interpreting.

res2: String = {"hello" : "world", "stackoverflow" : "ishere"}, {"1" : 1}

Answer 2

Try This

val s = List("JSONObject", "JSONObject", "JSONObject")
val result = s.mkString("[",",","]")
result: String = [JSONObject,JSONObject,JSONObject]