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

var is hoisted, let and const aren’t. And, const can’t be reassigned while let can.

2️⃣ What is the spread operator (…)?

spread operator (...) expands iterables, such as arrays or strings, where more than one arguments are expected, such as function calls.

3️⃣ What is the difference between map(), filter(), and forEach()?

map() applies the provided function on each element of an array and returns the result as a new array. filter() creates a copy of the provided array with the elements from the given array that pass the provided test implemented as a function. forEach() runs the given function on each element of the array, but it doesn’t return a new array. It always returns undefined.

4️⃣ What is an arrow function?

JavaScript functions that are defined with arrow syntax, such as () => expression, (param) => expression etc.

5️⃣ What are template literals?

Literals delimited with backticks that allow for multi-line strings, string interpolation etc. functionalities.