dart语言

函数

data(x,y){
    if(x>y){
      return x
  }else{
    return y
  }
}
// 等价于
data(x,y)=>(x>y)?x:y

函数类的概念

class Point(){
    var x,y;
   Point(this.x,this.y);
   scale(factor)=>new Ponit(){x*factor,y*factot\r}
}