Is it useful to learn JavaScript?

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Javascript is used for client-side scripting. It is useful for client-side validation and verification. For example, using Javascript, one can check whether mobile no. entered by the user contains only numbers and whether it is of 10 digits or not. So, it is useful to learn Javascript.
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Clean Code by Robert C Martin, is available in my profile please download and read it, irrespective of what language you code in, it will change the way you code. Also if you code in Javascript read https://12factor.net/ https://blog.risingstack.com/javascript-clean-coding-best-practices-node-js-at-scale/ For...

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