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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)
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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.
When I was learning Ruby a few years ago I found Ruby Koans a useful project in learning the language. The concept is it uses TDD to present you with a problem. You fix one failing test at a time and as you fix them the next failing test gets progressively more complex. Go has a similar project called Go Koans. It hasn’t seen an update in 2 years though it could still prove useful in learning Go concepts. It doesn’t meet your criteria for showing a solution afterward, but might still be a good option.