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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Projects-Solutions
:pager: Links to others' solutions to Projects (https://github.com/karan/Projects/)
Apart Form what others have suggested, there is this website ExercismExercism . Although the learning pace would be slow on this, but the biggest advantage you have is that you get mentorship. This is a community supported mentorship and it is really good. So it won't be like you just solving exercise which I guess you would have found many other websites for, your can get feedback on your code which I think is a big advantage when learning a new language. I mainly worked my way through learncpp.com and solving exercises on Exercism.
https://java-programming.mooc.fi/ is usually the most recommended.