JavaScript - when to put semicolon after function definition

In this article, we would like to show you when to put a semicolon after a function in JavaScript.

Rule:

Semicolons are used to separate statements.

Hints:

1. Semicolons aren't necessary after function declarations (since they are not statements).

function myFunction() {
    // ...
}

2. It is recommended to use semicolons after:

a) function expressions, because not using them may lead to bugs.

var myFunction = function() {
    // ...
}; /* <------- Semicolon is recommended */

const myFunction = () => {
    // ...
}; /* <------- Semicolon is recommended */

(function() {
    // ...
})(); /* <---- Semicolon is recommended */

(() => {
    // ...
})(); /* <---- Semicolon is recommended */

b) functions created with new operator, because not using them may lead to bugs.

var myFunction = new Function('/* ... */'); /* <---- Semicolon is recommended */

References

1. Semicolon - Wikipedia