scala-for高级用法

Posted 2020-10-12

/*高级for循环*/
  //这个叫守卫
  for(i <- 1 until 10 if i%3==0){ //修改步长
    println(i)
  }

for(i <- 1 until 10; if i%3==0){ //修改步长.其实是有个分号的
    println(i)
  }
   
//写法1：嵌套for循环
for (i <- 1 until 10 reverse){
    for(j <- 1 to 5){
      println(i+"--"+j)
    }
  }

//写法2：嵌套for循环
for (i <- 1 until 10;j <- 1 to 5){
    println(i+"--"+j)
  }

//生成新的Vector
var tmp = for (i <- 1 to 10)yield i*2
  println(tmp)