const Variable
What is const?
To store the constant variable values the const keyword is used. Variables defined with the const keyword cannot be redefined & cannot be reassigned.
The main advantage with const is that it prevents the variable to be assigned to another value.
In Real-time scenario const keyword is used to assign pre-defined math values, IP address of users and so on, which should be unique values.
Const is mainly used when we need to assign a values which should not be modified.
In JavaScript const variables must be assigned a value when they are declared otherwise it throws an Uncaught Syntax Error.
<html> <title> Re-declaring a Variable Using const keyword </title> <body> <script> const name; name="sailaja"; document.write(name) </script> </body> </html>
Output:
Redefining of const variable throws an Uncaught Syntax Error.
<html> <title> Redefining a Variable using const keyword </title> <body> <script> const name="sailaja"; document.write(name) </script> <script> const name="sailaja"; document.write(name) </script> </body> </html>
Output:
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