1) What is the difference between var, let, and const?

• var variables can be re-declared and updated
• let can be updated but not re-declared
• const cannot be updated or re-declared

2) What is the difference between map(), forEach(), and filter()?

• map(): => It is a built-in array method that makes a new array by applying a function to each element of an existing array. => It doesn’t change the original array.

• forEach(): => It is another array method. => It executes a function for each element, but it does not return a new array.

• filter(): => It is an array method in JS. => It picks only items that match a condition. => It gives back a new array.

3) What are arrow functions in ES6?

• It is a shorter and cleaner technique to write functions in JavaScript.

4) How does destructuring assignment work in ES6?

• It is an easier way to unpack values from arrays into variables.

5) Explain template literals in ES6. How are they different from string concatenation?

• Template literals are a new way to create strings using backticks instead of quotation mark.

    -> It uses backticks (``).
    -> It can insert variables or expressions directly by using ${}.
    -> It supports multi-line strings.