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1) What is a Union Type? “A union type lets a value be one of several types. It’s written with a pipe |.” let id: string | number; id = 42; // OK id = "42"; // OK // id = true; // Error Use it when a variable can legitimately hold different shapes or primitives (e.g., API IDs, configuration values, event payloads). 2) String/Numeric ...
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