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:
If the node is an output node, we add it to a list of outputs that need to be updated4.
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In their "Steam Year in Review 2025" update, Valve initially wrote that they "hope to ship in 2026," potentially indicating that the launch of the Steam Machine and its key accessories, the Steam Frame VR headset and controller, would be delayed until next year, but they have since amended the sentence to be more optimistic: "we will be shipping all three products this year."
Фото: Global Look Press
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