Update Basic Folder

Author: ankitsingh015

01_Basic/01_Variable.js

@@ -10,8 +10,22 @@ accountEmail="[email protected]"
 accountPassword="singh"
 accountCity="Bihar"
 
-console.log(accountId);
+console.log(accountId);     //144553
 
-//Prefer not to use var because of issue in block scope and functional Scope
+//Prefer not to use =>var<=
+// because of issue in block scope and functional Scope
 
-console.table([accountId,accountEmail,accountPassword,accountCity,accountState])
+console.table([accountId,accountEmail,accountPassword,accountCity,accountState])    //Output
+                                                                                    // ┌─────────┬───────────────────┐
+                                                                                    // │ (index) │ Values            │
+                                                                                    // ├─────────┼───────────────────┤
+                                                                                    // │ 0       │ 144553            │
+                                                                                    // │ 1       │ '[email protected]' │
+                                                                                    // │ 2       │ 'singh'           │
+                                                                                    // │ 3       │ 'Bihar'           │
+                                                                                    // │ 4       │ undefined         │
+                                                                                    // └─────────┴───────────────────┘
+
+
+
+                                   

01_Basic/02_DataType.js

@@ -30,8 +30,8 @@ let count= null
 // object 
 
 
-console.log(typeof "hitesh")
-console.log(typeof age)
+console.log(typeof "hitesh")    //string
+console.log(typeof age)         //number
 console.log(typeof null)        // object
 console.log(typeof undefined)  //undefined
 

01_Basic/03_conversionOperation.js

@@ -21,7 +21,6 @@ console.log(booleanIsLoggedIn)
 // "hitesh" => true
 
 let someNumber =33
-
 let stringNumber = String(someNumber)
 console.log(stringNumber)
 console.log(typeof stringNumber)
@@ -53,16 +52,17 @@ console.log(1+2+"2");   //output =>32
 
 
 
-console.log(+true);
-console.log(+"");
+console.log(+true);     //output => 1
+console.log(+"");       //output => 0
 
 let num1,num2,num3
 
 num1=num2=num3=2+2
 
 let gameCounter=100
-++gameCounter
-gameCounter++;
+++gameCounter               //First increase The ValueThen Use The Variable Value
 console.log(gameCounter);
+gameCounter++;              //First use The Variable Value Then Increase the value
+console.log(gameCounter);   
 
 

01_Basic/04_Comparison.js

@@ -1,17 +1,19 @@
-console.log(2>1)
-console.log(2 >=1)
-console.log(2<1)
-console.log(2 ==1);
-console.log(2!=1);
+console.log(2>1)    // true
+console.log(2 >=1)  //true
+console.log(2<1)    //flase
+console.log(2 ==1); //false
+console.log(2!=1);  //true
 
 
-console.log("2" > 1);
-console.log("02" > 1);
+console.log("2" > 1);   //true
+console.log("02" > 1);  //true
 
 console.log(null >0)        //false 
 console.log(null == 0)      //false
 console.log(null >= 0)      //true
-
+                            // ^
+                            // |
+                            // |
 // The reason is that an equality check == and comparisons > < >= <= work differently.
 // Comparions convert null to a number, treating it as 0
 // That's why (3) null >=0 is true and (1) null >0 is false.
@@ -22,4 +24,4 @@ console.log(undefined <0)       //false
 
 // ===  => strict check
 
-console.log("2" === 2)
+console.log("2" === 2)           //false

01_Basic/dataype-summary.js

@@ -7,19 +7,19 @@
     // #Primitive Data Type
     // 7 type : String, Number , Boolean, null, undefined, symbol,Bigint
 
-const score = 100
-const scoreValue=100.3
+const score = 100       //number
+const scoreValue=100.3  //number
 
-const isLoggedIn =false
-const outsideTemp= null
-let userEmail="email"
+const isLoggedIn =false     //Boolean
+const outsideTemp= null     //null
+let userEmail="email"       //string
 
-const id =Symbol('123')
-const anotherId=Symbol('123')
+const id =Symbol('123')         //symbol
+const anotherId=Symbol('123')   //symbol
 
-console.log(id);
-console.log(anotherId);
-console.log(id == anotherId);
+console.log(id);                //Symbol(123)
+console.log(anotherId);         //Symbol(123)
+console.log(id == anotherId);   //false
 
 const bigNumber = 3411541515151994n
 
@@ -40,7 +40,7 @@ const bigNumber = 3411541515151994n
     }
 
 
-console.log(typeof myfunction)
+console.log(typeof myfunction)      //function
 
 /*
 
@@ -76,19 +76,24 @@ let anotherName = myname
 
 anotherName = "rajesh"
 
-console.log(myname);
-console.log(anotherName);
+console.log(myname);        //ankit
+console.log(anotherName);   //rajesh
+
+// In This Data Type we pass the copy of variable's value
 
 // Heap  => Non-Primitive
 
 let user1 = {
-    email: "emai@gmail.com",
+    email: "email@gmail.com",
     upi: "user@mpl"
 }
 
 let user2 = user1
 
+console.log(user1);     //{ email: 'email@gmail.com', upi: 'user@mpl' }
+console.log(user2);     //{ email: 'email@gmail.com', upi: 'user@mpl' }
+
 user2.email ="[email protected]"
 
-console.log(user1);
-console.log(user2);
+console.log(user1);     //{ email: 'e-mail@gmail.com', upi: 'user@mpl' }
+console.log(user2);     //{ email: 'e-mail@gmail.com', upi: 'user@mpl' }