Learning to wren 2

Wren is a small, fast, class-based concurrent scripting language.

類

class Unicorn {
 #hidden = true //屬性
 isFancy { true } //getter
 rider=(value) { //setter
    System.print("I am being ridden by %(value).")
  }
  - { //相反數
    System.print("Negating a unicorn is weird.")
  }
  
  -(other) { //減法
    System.print("Subtracting %(other) from a unicorn is weird.")
  }
  
  [index] { //索引
    System.print("Unicorns are not lists!")
  }

  [x, y] { //二元索引
    System.print("Unicorns are not matrices either!")
  }
  
  [index]=(value) { //索引setter
    System.print("You can't stuff %(value) into me at %(index)!")
  }
  
  prance() {
    System.print("The unicorn prances in a fancy manner!")
  }

  prance(where) {
    System.print("The unicorn prances in %(where).")
  }

  prance(where, when) {
    System.print("The unicorn prances in %(where) at %(when).")
  }
  
  construct new(name, color) { //構造函數
    System.print("My name is " + name + " and I am " + color + ".")
  }
  
  
}

class Pegasus is Unicorn { //繼承
  construct new(name) {
    super(name)
  }
}

協程

var fiber = Fiber.new {|param|
  System.print(param)
  var result = Fiber.yield()
  System.print(result)
}

fiber.call("First") //> First
fiber.call("Second") //> Second