I've found that Java's pretty readable if you know JavaScript.
Practice Exercises for this book are available online here. I'm completing these as I read.
These are problems from Actualize Coding Bootcamp
These are problems I completed in a plain text file for practice and have added to ruby files for kicks.
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Ruby: Gold Level (5 stars)
- Rank: 1
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Problem Solving: Gold Level (5 stars)
- Rank: 49530
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SQL: Bronze Level (1 star)
- Rank: 210204
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10 Days of JavaScript: Silver Level (4 stars)
- Day: 5
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Mathematics
- Rank: 73287
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Ruby: 39/92 exercises
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R: 4/34 exercises
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Python: 1/115 exercises
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JavaScript 1/98 exercises
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Ruby: 5 exercises
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JavaScript: 1 exercise