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Scala Iterator exists()用法及代碼示例


exists()方法屬於類Abstract Iterator的具體值成員。它在IterableOnceOps類中定義。它測試使用的謂詞是否對指定集合中的至少一個元素成立。對於無限大小的集合,它不會終止。

函數定義: def exists(p:(A) => Boolean):Boolean

Where, p is the predicate.



返回類型: It returns true if the given predicate p is satisfied by at least one element of the stated collection, else it returns false.

範例1:

// Scala program of exists() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating an Iterator  
        val iter = Iterator(7, 3, 4, 11, 13) 
          
        // Applying exists method 
        val result = iter.exists(x => {x % 2 == 0}) 
          
        // Displays output 
        println(result) 
      
    } 
}
輸出:
true

範例2:

// Scala program of exists() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating an Iterator  
        val iter = Iterator(7, 3, 5, 11, 13) 
          
        // Applying exists method 
        val result = iter.exists(x => {x % 2 == 0}) 
          
        // Displays output 
        println(result) 
          
    } 
}
輸出:
false


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注:本文由純淨天空篩選整理自nidhi1352singh大神的英文原創作品 Scala Iterator exists() method with example。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。