Lyft

[darrenfu]

12/09/2019

157. Read N Characters Given Read4
Given a fetch_by_page(page) method, implement a fetcher.fetch(nums_of_results) method using this method. Write some test cases to verify it.
Note:

1. It could return empty results if reaches the end.
2. page number starts from 0.
3. page size is a fixed number, let's say 10.

Follow-up:

1. What if page size is a variant?
2. 158. Read N Characters Given Read4 II - Call multiple times What if the fetcher is stateful? Every time you call fetch, it will continue with the previous offset. If it reaches the max_results, no records will be returned anymore unless you recreate another fetcher instance.

[darrenfu]

1. Be careful with the page number 0.
2. Be careful with the edge case of the remainder elements in the last page.

Follow up:

1. Every time you call fetch, check the page size to see whether it reaches the end.
2. Use two instance variables self.local_offset and self.pagenum to store the previous fetch states.