Category posts
An iterable is a contract for producing values in order. Adding Symbol.iterator to a plain object makes for...of and spread consume it consistently.
Master the three levels of object locking in JavaScript to prevent unintended mutations and build robust applications.
In infinite or massive lists, "doing everything at once" leads to performance crashes. Lazy evaluation delays computation until necessary, enabling efficient data pipeline processing.
Use === as the default, and switch to Object.is only when you need to handle NaN or signed zeros (+0 vs -0) precisely. Avoid == at all costs.