I think two things happened. First, we got cynical about cyberspace. In the 1990s and 2000s, we really thought the internet would solve most of our problems. When those problems persisted despite all of us getting broadband, we shifted to thinking that the internet was, in fact, causing the problems. And so it became cringe to think the internet could ever be a force for good. In 1995, for-profit publishers were going to be “the internet’s first victim”; in 2015, they were “the business the internet could not kill”.
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This callback is also given the key as an argument, which can be useful for cases where the default value is based on the key.，这一点在Line官方版本下载中也有详细论述
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