polyfill_bind.html

<!DOCTYPE html>
<html>
<body>

<h2>Call</h2>
<p>Open console to check</p>
<script>
    let person = {
        firstname: 'Piyali',
        lastname: 'das'
    }

    let display = function() {
        console.log(this.firstname + ' ' + this.lastname);
    }

    Function.prototype.mybind = function(...arg) {
        let obj = this; // this refers to person object
        return function() {
            obj.call(arg[0]);
        }
    };

    let print = display.mybind(person);
    print();

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