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配列でも可変長引数でもOKな書き方

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そういえばできるなぁと思って

function add(args) {
  if (Array.isArray(args)) return add.apply(null, args);
  var i = 0, n = arguments.length, sum = 0;
  for(;i < n; ++i) sum += arguments[i];
  return sum;
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