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JavaScript - when to put semicolon after function definition
3 points
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.
1. Semicolons aren't necessary after function declarations (since they are not statements).
xxxxxxxxxx1
function myFunction() {2
// ...3
}
2. It is recommended to use semicolons after:
a) function expressions, because not using them may lead to bugs.
| Old JS | ES6+ |
xxxxxxxxxx1 var myFunction = function() {2 // ...3 }; /* <------- Semicolon is recommended */ |
xxxxxxxxxx1 const myFunction = () => {2 // ...3 }; /* <------- Semicolon is recommended */ |
xxxxxxxxxx1 (function() {2 // ...3 })(); /* <---- Semicolon is recommended */ |
xxxxxxxxxx1 (() => {2 // ...3 })(); /* <---- Semicolon is recommended */ |
b) functions created with new operator, because not using them may lead to bugs.
xxxxxxxxxx1
var myFunction = new Function('/* ... */'); /* <---- Semicolon is recommended */
