notes.txt

 # ( == vs === in JavaScript ) 

-) == (Loose Equality / Abstract Comparison)
                                             - Compares values only.

                                             - Performs type coercion if the data types are different.

                                             -  Can lead to unexpected results if not careful.

Example:
______________________________________________________________________________
| 5 == "5"        // true   (number and string are coerced to same type)      |
| 0 == false      // true   (both coerced to same type)                       |
| null == undefined // true (they're loosely equal)                           |
|_____________________________________________________________________________|

-)  === (Strict Equality / Strict Comparison)
                                            -Compares both value and type.

                                            - No type coercion.

                                            - Safer and more predictable, recommended for most cases.
_____________________________________________________________________________
| 5 === "5"       // false  (number vs string, types are different)          |
|  0 === false     // false  (number vs boolean)                             |
|  null === undefined // false                                               |
|____________________________________________________________________________|

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# Primitive Data Types
   Immutable (cannot be changed) and stored directly in memory.

Primitive types are basic, single values, not objects.
When you copy them, a new independent value is created.

    Primitive types in JavaScript:
                            1.String – "Hello"
                            2.Number – 42, 3.14
                            3.Boolean – true / false
                            4.Undefined – variable declared but not assigned
                            5.Null – intentional empty value
                            6.Symbol – unique value (Symbol("id"))
                            7.BigInt – large integers beyond Number.MAX_SAFE_INTEGER (123n)



# Non-Primitive (Reference) Data Types
   Mutable (can be changed) and stored as references in memory.

Non-primitive types are objects or things built from objects.
When you copy them, you copy the reference (pointer to the same memory location), not the actual value.

     Non-primitive types:
                         1.Object – { name: "Parvez" }
                         2.Array – ["apple", "banana"]
                         3.Function – function greet() {}
                         4.Date, RegExp, Map, Set, WeakMap, WeakSet, etc.