Semicolon for declaring functions in JavaScript

When declaring a function as a Function Declaration, there is no semicolon after the curly brace }:

function func() { console.log('!'); }

But if the function is declared as a Function Expression, then after } a semicolon is placed:

let func = function() { console.log('!'); };

Why: because in JavaScript any expression must end with a semicolon, and in this case we just have an expression. This semicolon is optional, since JavaScript generally allows them to be omitted, but it is desirable. Always put :)

Put semicolons in all the necessary places:

let func1 = function() {console.log('!')} let func2 = function() { console.log('!') } function func3() { console.log('!') }