FOUR DIFFERENT WAYS TO WRITE FUNCTIONS IN JAVASCRIPT

Functions are the basic building blocks of the Javascript. A function in Javascript is a code block that performs a specific task or set of tasks.
There are basically 4 (four) different ways we can define functions in Javascript.

• Function Declaration
• Function Expression
• Arrow Function Expression
• Concise Arrow Function Expression

// Function Declaration
function square(x) {
    return x * x;
}

// Function Expression
const square = function(x) {
    return x * x;
}

// Arrow Function Expression
const square = x => {
    return x * x;
}

// Concise Arrow Function Expression
const square = x => x * x;

If you prefer you can take a look at the video tutorial,

Comments

[Thomas Junkツ]

Thank you! Nice writeup!

Would you mind, elaborate a bit?
Where are the differences besides different ways of declaration?
What is the scope / when could it be referenced?
If you use a function expression, does hoisting play into that?

[Marcos Henrique]

Thank you for this post!
If you put "javascript" term after the code delimiter the js syntax will be highlighted, like that:

console.log("I AM highlighted")