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Fastest growing programming language Still is JAVA
If you mean by the number of users, then Java is still the leader credit going to android, enterprise application and platforms, but probably it may decline in favor of Kotlin that officially supported by google as android programming language.
JavaScript is a challenge that gain momentum in the last few years developed from adding effects and few under the hood work to fully build web application on both front-end (client) and backend (server) side as the rise of frameworks like Google’s angular and Facebook’s react.
You can refer to https://www.tiobe.com/tiobe-index/ for monthly update
The stages of all programming languages in the market is something like this.
Intro of a language(less demand)->Leaning, Understanding the uses and using it full(high demand phase)->get consistent in market(saturation point)->new technology in market(less- end demand).
As of now, All the programming languages that are associated with Data Science, Business Intelligence, and Artificial Intelligence are under the boom.
It will easily take 2-4 years to get these saturated.
You can try any of the above.
The specialists in this field do not agree on what is the fastest but there is always new and better with the progress of humanity