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Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

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Data Structures and Algorithms Intermediate Clear filters 4 results
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Python Dictionary Comprehensions: When They Help and When They Hurt

A dictionary comprehension builds a dictionary in one line. Good for transforming, filtering and building lookups. Bad for nested logic, side effects and anything that needs error handling. Shorter code is not always better code.

5 min read
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map, filter, reduce on a Real List of Orders

Five questions a manager would ask about a list of orders, each answered with map, filter, reduce or a plain loop. Real data includes an empty order, and the code has to survive it.

4 min read
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Write a Generic identity and map Without Losing Types

Turn two any-typed helpers into generic functions and see what the compiler now catches. After this, a typo or a wrong method on the result is a compile error.

4 min read
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Record Keys That Match a Real Enum

Key a lookup table by an enum or a union of literals so a missing or misspelled key is a compile error. After this, adding a status shows you every table that needs an entry.

3 min read