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Title: Update introduction.md by buuug7 · Pull Request #1 · wangdoc/javascript-tutorial · GitHub

Open Graph Title: Update introduction.md by buuug7 · Pull Request #1 · wangdoc/javascript-tutorial

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Description: Optimizing the expression

Open Graph Description: Optimizing the expression

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Opengraph URL: https://github.com/wangdoc/javascript-tutorial/pull/1

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