Scala山脉

拼搏现实的明天。 2023-03-05 08:29 1阅读 0赞

**Scala Range**

**Scala山脉**

A Range is a bounded series with a uniform interval with an upper and lower limit. The range literal is a numerical sequence of number ranging with a certain limit.

范围是一个有上限且下限均匀的有界序列。 范围文字是具有一定限制的范围内的数字的数字序列。

This defined sequence has many uses in programming like in easy initialization of the loop, sequence problems, etc.

此定义的序列在编程中有许多用途，例如在循环的轻松初始化，序列问题等中。

**Methods to initialize a range**

**初始化范围的方法**

There are multiple methods by which a range variable can be initialized. They are,

有多种方法可以用来初始化范围变量。 他们是，

1.  **By using "to" keyword**
    
    **通过使用“ to”关键字**
    
        Syntax : var range_name = a to b 
        Example: var a = 3 to 6 // gives 3 , 4, 5, 6.
2.  **By using "by" keyword with others: Increases the interval** 
    
    **通过与其他用户一起使用“ by”关键字：增加间隔**
    
        Syntax : var range_name =  a until b by x
        Example: var a = 3 until 10 by 2 // gives 3, 5, 7, 9.
3.  **By using "range" keyword**
    
    **通过使用“范围”关键字**
    
        Syntax : var range_name = range(a,b,x) 
        Example: var a = range(3,6,1)// gives 3 , 4, 5,6.

The range can also be directly initialized to a data structure like an array, list, vector, map. Methods to initialize range to an array:

范围也可以直接初始化为数据结构，例如数组，列表，向量，映射。 将范围初始化为数组的方法：

**toarray Method**

**数组方法**

var var_name = (2 to 6 ).toarray

**Using range method of array object**

**使用数组对象的范围方法**

var var_name = Array.range(5 to 9)

In a similar way List and vector method works.

List和vector方法以类似的方式工作。

**Sample code to illustrate use of Scala range**

**示例代码说明了Scala系列的用法**

object myObject 
    {
         
        def rangeprint(a:Range){
        
            println(a) 
            println(a(1)) 
            println(a.last) 
        }
        
        def main(args: Array[String]) 
        {
         
            val R1 = 3 to 6
            val R2 = 3 until 7
            var R3 = 3 to 11 by 2
            var R4 = Range(3,45,4)
            
            rangeprint(R1)
            rangeprint(R2)	
            rangeprint(R3)	
            rangeprint(R4)
        } 	
    }

**Output**

**输出量**

Range 3 to 6
    4
    6
    Range 3 until 7
    4
    6
    Range 3 to 11 by 2
    5
    11
    inexact Range 3 until 45 by 4
    7
    43

> 翻译自: [https://www.includehelp.com/scala/ranges-in-scala.aspx][https_www.includehelp.com_scala_ranges-in-scala.aspx]

[https_www.includehelp.com_scala_ranges-in-scala.aspx]: https://www.includehelp.com/scala/ranges-in-scala.aspx