first basic grammar

scala is a statically typed language. 
scalac aaa.scala compile scala 
scala aaa.scala run scala 

values ​​and variables: 
  val x:Int = 1 val x = 1 (type inferred) 
  var x:Int = 2 var x = 2 
  lazy value 
    a:Int = <lazy> //Defined now, load the 
method definition when using: 
  def method name (parameter: parameter type): return type = { 
    //The last line in the block returns the value 
  } 
  When the return value is Unit, it can be defined as: 
  def method name (parameter name: parameter type) {} 
  There is no static method in scala, and similar things are implemented by object. 
Conditional expression: 
  if(x > 0) 1 else -1 
  val a = if(x > 0) 1 else -1 
For loop: 
  to: 1 to 5 Generates: Range(1,2,3,4,5) 
  until : 1 until 10 Generate: Range(1,2,3,4) 
  Range: Range(1,5) Generate: Range(1,2,3,4) 
  Range(1,5,2) Specify the step size 
  for(i <- 1 to 10){}
  for(i <-1 until 10){} 
  for(i <- 1 to 10 if i %2 ==0){} //Add condition to i 
  for without continue and break 
parameter style: 
  1: default parameter 
    def sayName( name : String = "lxm"){} 
    sayName("xj") sayName() 
  2: parameter with name 
    def add(x : Int , y : Int) : Int = { 
      x+y 
    } 
    add(y = 2 , x = 5) 
  3: Variable length parameters: 
    def sum(slems : Int*){} 
    sum(1,2,3,4,5) 
  Exception handling: 
    try{ 
     brock(redis) 
    }catch{ 
      case e : Exception =>System .err.println(e) //Pattern matching 
      case _ => //None of the above 
    }finally{ 
      this.close(pool,redis) 
    }