🧒 Explain like I'm 5
Normalize: instead of copying a person's name into 5 different places (and having to update 5 locations if the name changes, which is prone to errors), you record the name once in a directory and reference it by an index everywhere. Optimistic update: when you click "like," the red heart appears immediately without waiting for the server's confirmation — if the server reports an error, then the heart is removed.
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Senior-level deep dive: internals, pitfalls, and a self-interview ladder.
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