Code compression in JavaScript is generally used for JavaScript library files. (There is also a trade-off between having a huge library file and putting everything needed in it versus having small snippets tailored to each page, keeping code-size small and having no library at all. The former will increase page-load time considerably and may be annoying for visitors. The latter will be rewriting, copy & pasting code around, which will be annoying for you as a developer. To find the optimum point in between is up to you.)
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