斯卡拉REPL不打印范围

Question

当我尝试在斯卡拉REPL打印范围如何它不给我的数字列表。

它给了我范围（0至20），而不是打印范围（1,2,3,4,5,6,7,8,9,10）

Scala REPL range printout

Answer 1

它看起来像Range的toString函数已在Scala 2.12中更改。

测试与2.12.0：

scala> (1 to 10) 
res0: scala.collection.immutable.Range.Inclusive = Range 1 to 10 

测试与2.11.8：

scala> (0 to 10) 
res0: scala.collection.immutable.Range.Inclusive = Range(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) 

Source code for 2.12：

override def toString = { 
    val preposition = if (isInclusive) "to" else "until" 
    val stepped = if (step == 1) "" else s" by $step" 
    val prefix = if (isEmpty) "empty " else if (!isExact) "inexact " else "" 
    s"${prefix}Range $start $preposition $end$stepped" 
} 

Source code for 2.11：

override def toString() = { 
    val endStr = 
    if (numRangeElements > Range.MAX_PRINT || (!isEmpty && numRangeElements < 0)) ", ...)" else ")" 
    take(Range.MAX_PRINT).mkString("Range(", ", ", endStr) 
} 

---