Day10Symboltype.html

<!DOCTYPE html>
<html>
    <head>
        <title>
            Day10
        </title>
    </head>
    <body>
        <script>
            // Symbol() is a new primitive type added in ES6
            let something= Symbol();
            let thing = Symbol();

            console.log(something==thing)// false
            // because each time when we create symbol
            // it is new identifier , it is uniquie

            let newvalue=Symbol("hello")
            console.log(newvalue); // symbol(hello) ---- output
           // alert(something)// alert acpts string type ,so it will give error

           
            alert(newvalue.toString())// Symbol(hello)
            alert(newvalue.description);// hello --- will be printed

            let sym= Symbol.for("name")// gobal registry
            let sym1=Symbol.for("firstname")

            console.log(Symbol.keyFor(sym));//name


            //object
            let firstname=Symbol("firstname");
            let person={
                [firstname]:"ponmani"
            }
            console.log(firstname);


        </script>
    </body>
</html>