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Lists and Arrays
6.1🔒OverviewLists (Python) and arrays (JavaScript/TypeScript) are the most common data structures in QA. Test suites are lists of test cases. API…
6.2🔒Creating and IndexingTypeScript's readonly modifier prevents accidental mutation of shared test data -- a common source of test pollution.
6.3🔒SlicingSlicing extracts a portion of a list. Useful for pagination testing, sampling, and splitting data sets.
6.4🔒Common MethodsIdiomatic TypeScript favors immutable operations (spread + filter) over mutating methods. This prevents shared test data from being…
6.5🔒Iteration with IndexWhy This Matters for QA: Test data lives in lists -- test case names, status codes, user records, API endpoints. Slicing is used when…
6.6🔒Exercises: Chapter 6Easy: Write a function in all three languages that takes two lists -- expected and actual -- and returns an object/dict with missing (in…
6.7🔒Q&AQuiz: Chapter 61. How do you access the last element of a list in Python vs JavaScript? 2. What does readonly string[] do in TypeScript that string[] does…
6.8🔒Career Translation- Built test result processing pipelines using array operations (sort, filter, slice, map) to compute pass rates, identify slowest tests…
6.9🔒Q&AInterview Depth CheckPrompt: You have a list of 1000 test results and need to find the 10 slowest tests. How do you do this efficiently? What a strong answer…