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JavaScript is basically the only option for front end web dev (unless you do web assembly, but that's pretty new). There are lots of different JavaScript frameworks that you can use, including react, so I think they are referring to the alternative frameworks rather than languages.

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Certainly not the only language, see my reply above (or below depending). There are a lot of great languages which either compile to JS perfectly or have been built with that purpose in mind.

Does WebAssembly actually replace JS or is it another language that compiles into it?

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