Function Expression and Function Declaration

When we want to define a function in JavaScript during the day, we can use more than one method. You probably know how they are.

function func(){}const func = () => {}

Although we use these often, we may not know and be curious about their differences, advantages and disadvantages. The main issues I will mention in this article are;

• Hoisting
• Anonymous Functions — Named Functions
• IIFE
• Garbage Collection

Before touching these issues, let’s look at what is expression and declaration.

Expression:

An expression is any valid set of literals, variables, operators, and expressions that evaluates to a single…