test-14.js

 function one() {
        const username = "Arafat"
        function two() {
            const website = "Youtube"
            console.log(username);
        }
        // console.log(website); // This is Getting "Error",because This "console.log(website)" inside the "function two(){}".
        two(); // But if I comment Out Of "two()" function then not execute of "console.log(username)".
    }
    // one();

    if (true) {
        const username = "Arafat"
        if (username==="Arafat") {
            const website = " youtube"
            // console.log(username+website);
            
            
        }
        // console.log(website); // This is Getting "Error",because This "console.log(website)" inside the "second scope{}".
    }
    // console.log(username); // This is Getting "Error",because This "console.log(username)" inside the "first scope{}".


    function addOne(num) {
        // console.log(num);

        // console.log(addOne); // [Function: addOne] (Not Unexpected!!!)

        return num + 1

        // console.log(num);
        // console.log(addOne);
        // [return এর পরে কোনো কিছুই print / console.log হয় না ]
    }
    // console.log(num); //ReferenceError: num is not defined (As I Expected!!!) 
    // console.log(addOne); // [Function: addOne] (Not Unexpected!!!)

    // addOne(5)
    // addOne(5)

    const addTwo = function (num) {
        // console.log(addTwo(7)); // RangeError: Maximum call stack size exceeded
        // console.log(addTwo);
        // console.log(num); // "undefined" For   'console.log(addTwo());'

        return num + 2
        // console.log(addTwo);
        // console.log(num);
    }
    // console.log(addTwo);
        // console.log(num);
        // console.log(addTwo()); //NaN  // এটার জন্যে Undefined , NaN,7 আসে...!  
        // console.log(addTwo(8));
    // addTwo(7)



    addThree(5)
    // console.log(addThree(5));
function addThree(num) {
        return num + 1
    }
    // addThree(5)
    // [ এখানে " Error " না আসার কারন হল ' Access:addFour(5) ' আগে  করা হয় নাই  " Declaration: const addFour = " এর পূর্বে ! ]


/*
    // addFour(5) // Now given to the error... Because This Problem seems to "Hoisting" // ReferenceError: Cannot access 'addFour' before initialization
    const addFour = function(num) {
        return num + 2
    }

    // [ এখানে " Error " আসার কারন হল ' Access:addFour(5) ' আগেই করা হয়েছে " Declaration: const addFour = " এর পূর্বে ! ]
*/