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by sfifs
3336 days ago
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You're comparing reference to infer whether underlying data changed? Sounds really really fragile... Does the JavaScript language guarantee this or are you depending on the specific engine implementation? For instance will this still hold if the OS preempts the browser out and restores it later? |
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The assumption is that if two objects are different references, then their contents are also different. It's possible that you could have two different objects whose fields point to the exact same contents, but given a typical application setup that's unlikely. So, a simple `a === b` (or if you're looking at all the contents, `first.a === second.a && first.b === second.b && .....`) is just some quick pointer comparisons in the JS engine. So, at the JS level you don't care what the pointer address actually _is_, just whether the two variables point to different things in memory.