Why do they recommend using Let if most plugins/applications/Ibraries still use var?

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Why do they recommend using let if most of the plugins/aplicativos/libraries still use var? Should I start adopting in my applications use or not? Some examples of plugins/applications/Ibraries that have not yet adopted let:

Jquery 3.3.1 CDN

Angular 1.7.0 CDN

React

javascript html

  • "Why do they recommend using let"... Fountain?

  • let and var although they serve to declare a variable, has a slightly different behavior: Let and var

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    Probable dup https://answall.com/q/47165/101

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