Every JavaScript value has exactly one of (currently) eight different types: Number, String, Symbol, BigInt, Boolean, Undefined, Null, and Object. As such, null means “no object value”, whereas undefined means “no value”.
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The story of a V8 performance cliff in React · V8
Every JavaScript value has exactly one of (currently) eight different types: Number, String, Symbol, BigInt, Boolean, Undefined, Null, and Object. As such, null means “no object value”, whereas undefined means “no value”.
Full article