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/**
 * 一个工具方法，抛出错误异常
 *
 * 使用
 * $errStr = myMinErr()
 * throw $errStr('This {0} is {1}', 'foo', 'bar')
 * 返回：Uncaught Error: This foo is bar
 *
 * $errType = myMinErr(TypeError)
 * throw $errType('This {0} is {1}', 'foo', 'bar')
 * 返回：Uncaught TypeError: This foo is bar
 *
 * 因为返回的是个闭包，跟上面一样
 * throw myMinErr(TypeError)('This {0} is {1}', 'foo', 'bar')
 */
function myMinErr(ErrorConstructor) {
  ErrorConstructor = ErrorConstructor || Error;
  return function() {
    var message = '', arg = arguments, template = arguments[0]
    // 提取 {0}, {1}
    message += template.replace(/\{\d+\}/g, function(match) {
      // 从"{0}" 中提取出"0" 然后返回数字0
      var index = +match.slice(1, -1) + 1
      // 保证长度一致 $errStr('This {0} is {1} {2}', 'foo', 'bar')
      if (index < arg.length) {
        // 这里可以传个其他方法对实参进行验证或过滤
        return arg[index]
      }
      return match
    }) 
    return new ErrorConstructor(message)
  }
}

$errStr = myMinErr()
console.log($errStr('This {0} is {1}', 'foo', 'bar'))
console.log($errStr('This {0} is {1} and {2}', 'foo', 'bar', 'xx'))
console.log($errStr('This {0} is {1} {2}', 'foo', 'bar'))
console.log($errStr('cpta', "Can't copy! TypedArray destination cannot be mutated."))

throw myMinErr(TypeError)('This {0} is {1}', 'foo', 'bar')