Closures keep values from a particular call
Run two closure-backed counters, rebuild one listener owner, and distinguish live bindings, precomputed strings, object mutation and loop environments.
Foundation
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A little theory. A lot of practice.
Date-only values are not timestamps
Keep Gregorian birthdays separate from instants, build a localized native-date comparison and test why consecutive noons can be 23 or 25 hours apart.
Foundation
Copying an array does not copy its objects
Update native checkboxes and nested metadata while preserving a saved baseline, then test no-op identity, shared references, structured cloning and shallow freeze.
Foundation