var let const 3 major diff

Mehak-Kamran · Mehak-Kamran · commit 740a49be3c5f · 2024-08-31T11:06:02.000Z
diff --git a/revision/rev2.js b/revision/rev2.js
@@ -0,0 +1,30 @@
+//var const let
+
+let a=5
+var b=1
+const c=3
+
+console.log("original values",a,b,c)
+a=6
+b=2
+// c=4
+console.log("updated values",a,b,c)//giving error bc of c
+
+function abcd(){
+    var d=3 //function scoped
+   
+    
+
+    if(1){
+        const e=4
+        let f=5 // braces scoped
+        console.log(e,f,d)
+    }
+    console.log(e,f)
+    
+}
+abcd()
+
+
+// var add itself in window obj which is highly insecure for data privacy thats why let and const 
+//were introduced which if defined in script.js will not add themself in window obj
