The Miracle of Generators
summary
Explains how ES2015 generator functions and the iterator protocol produce lazy infinite streams (example: an infinity generator) and how yield is bidirectional so a generator can receive values back. Builds a small run(iterator) driver that awaits Promises and returns a Promise of the final result, demonstrates fetching a text file with fetch(). Shows a generalized fetch-as-generator helper, composes take/map over infinite iterables, and integrates a Maybe-like wrapper to avoid undefined — the demos run successfully.
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