Primitive ↔ non-Object base data-type UNNBBSS

aka Primitive-Value, Primitive-Type, Primitives

immutable

(of entity/variable) content cannot be altered

Autoboxing

Global Object Wrapper for Primitive to share methods & properties

number

Primitive Value to rep FP64 numeric data Type

bigint

Numeric Primitive Value to rep integer with arbitrary precision to store numbers > Number.MAX_SAFE_INTEGER

boolean

Logical Primitive Value = true || false

string

Primitive Value rep an ordered sequence of Character

symbol

immutable constant Primitive Value to rep unique Object property keys

null

Primitive Value rep absence of any value; explicitly empty

undefined

Primitive Value to rep Variable "not initialized" or "not existing" (for object property)

References

1. Object ↔ any non-Primitive Variable Type rep a collection of properties. Pass by reference

2. String ↔ Autoboxing Wrapper for string Primitive

3. Number ↔ Autoboxing Wrapper for number Primitive

4. BigInt ↔ Autoboxing Wrapper for bigint Primitive

5. Boolean ↔ Autoboxing Wrapper for boolean Primitive; converts Argument to boolean

6. Symbol ↔ Autoboxing Wrapper for symbol Primitive to return unique immutable symbol

7. + ↔ Addition Operator to convert Operand to Primitive & then add/join in either String Mode or Number Mode

8. react-router-dom ↔ React Lib for Routing Primitives to Client Routing & Server Side Render in Declarative Composable way

9. Coercion ↔ (mechanism) to Implicit auto convert Type of Primitive Operand by JS Compiler

10. Minimalist ↔ React focus to UI Primitives , defer other design concerns to React Ecosystem

11. Autoboxing ↔ Global Object Wrapper for Primitive to share methods & properties

12. Typed Object ↔ Type to ref any non-Primitive; as Record or Dictionary

13. Array ↔ ordered sequence of elements of any type (Primitive || Object)