1. What is the use of flat_map in ruby ?
2. How do you differentiate between find and find_by ?
3. Difference between modules and class ?
4. What is Object-Relational Mapping?
5. What is git squash and git rebase ?
6. Differentiate between App Server and Web Server ?

Question

1. What is the use of flat_map in ruby ? 
2. How do you differentiate between find and find_by ?
3. Difference between modules and class ?
4. What is Object-Relational Mapping?
5. What is git squash and git rebase ? 
6. Differentiate between App Server and Web Server ?

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