Chained Data Pipelines

HardHigher Order FunctionsChainingPRO

Build a JavaScript chaining pipeline that filters completed lessons, transforms useful fields, and reduces them into a stable summary object. This hard exercise focuses on choosing each step by the data shape it returns.

What you'll practice

Build a JavaScript chaining pipeline that filters completed lessons
Transforms useful fields
Reduces them into a stable summary object
Choosing each step by the data shape it returns

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