JavaScript Learning Notes: Variables

Variables

Variables are Containers for Storing Data.

JavaScript Variables can be declared in 4 ways: 1. Automatically 2. Using var 3. Using let 4. Using const


                    //Automatically
                    accountCity = "Jaipur"

                    //Using var
                     var accountPassword = "12345"
                    
                    //Using let
                     let accountEmail = "hitesh@google.com"
                     let accountState;

                    //Using const
                    const accountId = 144553



                    accountEmail = "hc@hc.com"
                    accountPassword = "21212121"
                    accountCity = "Bengaluru"


                    console.table([accountId, accountEmail, accountPassword, accountCity])
                    
                

Console Output:

(index) Values
0 144553
1 'hc@hc.com'
2 '21212121'
3 'Bengaluru'

-> accountId = 2 // not allowed as const values can't be changed -> Prefer not to use var because of issue in block scope and functional scope.

difference b/w scopes