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null ↔ Primitive Value rep absence of any value; explicitly empty

_!snippet equality null vs undefined_

References​

  1. Primitive Value ↔ undefined, null, number, bigint, boolean, string, symbol

  2. UNNBBSS ↔ undefined, null, number, bigint, boolean, string, symbol

  3. ?? ↔ Nullish Coalescing Operator to assign left calling Operand if !== null/undefined, else assign fallback value (right Operand)

  4. use ": [void](void)" for functions that ↔ should return null/undefined

  5. "strictNullChecks": true ↔ to throw Exception when access Variable which potentially be null/undefined

  6. Non-Null Assertion Operator ↔ postfix ! Type Assertion to Assert that Variable ≠ undefined || null