CoffeeScript 变参(splats)

使用 JavaScript 的 arguments 对象是一种处理接收不定数量个参数的函数常用办法. CoffeeScript 在函数定义和调用里提供了变参(splats) ... 的语法, 让不定个数的参数使用起来更愉悦一些.

gold = silver = rest = "unknown"
awardMedals = (first, second, others...) ->
  gold   = first
  silver = second
  rest   = others
contenders = [
  "Michael Phelps"
  "Liu Xiang"
  "Yao Ming"
  "Allyson Felix"
  "Shawn Johnson"
  "Roman Sebrle"
  "Guo Jingjing"
  "Tyson Gay"
  "Asafa Powell"
  "Usain Bolt"
]
awardMedals contenders...
alert "Gold: " + gold
alert "Silver: " + silver
alert "The Field: " + rest

var awardMedals, contenders, gold, rest, silver,
  __slice = [].slice;
gold = silver = rest = "unknown";
awardMedals = function() {
  var first, others, second;
  first = arguments[0], second = arguments[1], others = 3 <= arguments.length ? __slice.call(arguments, 2) : [];
  gold = first;
  silver = second;
  return rest = others;
};
contenders = ["Michael Phelps", "Liu Xiang", "Yao Ming", "Allyson Felix", "Shawn Johnson", "Roman Sebrle", "Guo Jingjing", "Tyson Gay", "Asafa Powell", "Usain Bolt"];
awardMedals.apply(null, contenders);
alert("Gold: " + gold);
alert("Silver: " + silver);
alert("The Field: " + rest);

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