Delon Newman's HackerRank Certificates
Certificate: Ruby (Intermediate)
skill
Certificate: Ruby (Basic)
skill
Certificate: JavaScript (Basic)
skill
Certificate: JavaScript (Intermediate)
skill
Certificate: SQL (Basic)
skill
Certificate: SQL (Intermediate)
skill
Certificate: SQL (Advanced)
skill
Certificate: Rest API (Intermediate)
skill
Certificate: C# (Basic)
skill
Ruby (Intermediate)
It covers topics like Ruby Built-ins, Hash, Range, Set, Collections and Enumerables, simple regular expressions, reading, and writing to JSON and XML file types, among others