scala early learning

Anonymous function filter () the Map () reduceLeft ( + )

Code:
Experiment a:
Import scala.math._
Object function {
DEF main (args: the Array [String]) {

val testList=Array(1,2,3).map(x=>x*2)
for (i <- testList){
  println(i)
}

def mul(x:Int):Int={
  x*2
}
val newList=testList.map((a:Int)=>mul(a))
for (i <- newList){
  println(i)
}

 //作为值的函数

val num = 3.14

val fun = ceil _ //fun设为ceil函数

//_ 将ceil方法转换成函数

println(fun(num))

}
}

Experiment two:

object high {
def main(args:Array[String]){

def powerOfTwo(x:Int):Int={if(x==0) 1 else 2*powerOfTwo(x-1)}

val wordsList=Array("spark1","hadoop2","flink3","spark2")
val filterList=wordsList.filter((word:String) => word.contains("spark"))

val num=(1 to 3).reduceLeft(_+_)//最终结果是一个数值
(1 to 3).map("*" * _).foreach (println(_))

println(num)

// numList.foreach(println())
println(“过滤前:”)
wordsList.foreach(println())
println(“过滤后:”)
filterList.foreach(println())
print(powerOfTwo(3))

}
}
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