Functions: Basics

Question 1

What is the basic function syntax (no args)

Answer 1

function greet() {
	console.log("Hey there");
}

Question 2

What is the basic function syntax with arguments?

Answer 2

function greet(title, name) {
	console.log(`Hey there ${title} ${name}!`);
}

Question 3

When should you use a return statement?

Answer 3

Whenever you want to reuse or store the result of a function (which is most of the time!)

You can write your return statement plus code on the same line.

Question 4

What is a function expression?

AKA an anonymous function.

Answer 4

When you assign a function to a const variable - you do not need to declare a function name.

You can then use this const with arguments in the same way you would use a function.

Eg:

// Function Statement
function add(x, y) {
  return x + y;
}

// Function Expression (Anonymous)
const sum = function (x, y) {
  return x + y;
}

Question 5

What is hoisting?

Answer 5

Hoisting allows you to access to variables and function declarations before they are defined.

This is considered bad practice however.