Maps are unordered key-value collections with string keys. Use them when you need to look up values by name rather than by position.
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When one of the input cells changes, all the cells that depend on it need to react to that change — the aforementioned reactivity. In practice, though, this is the bare minimum requirement. When building reactive systems, there are usually some additional requirements we impose that make the problem harder:
Алексей Гусев (Редактор отдела «Спорт»)
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