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Title: Update solution.md by X-5B · Pull Request #240 · javascript-tutorial/en.javascript.info · GitHub

Open Graph Title: Update solution.md by X-5B · Pull Request #240 · javascript-tutorial/en.javascript.info

X Title: Update solution.md by X-5B · Pull Request #240 · javascript-tutorial/en.javascript.info

Description: As described later, the answer should be 1. No more "undefined".

Open Graph Description: As described later, the answer should be 1. No more "undefined".

X Description: As described later, the answer should be 1. No more "undefined".

Opengraph URL: https://github.com/javascript-tutorial/en.javascript.info/pull/240

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