Initialization in variable declarations against recommended approach JS-0119
Anti-pattern
Minor
5 months ago
—
2 years old
Variable 't' should be initialized on declaration
23 }
24 );
25 console.debug("User theming enabled.");
26 let t,27 n = s();
28 switch ((console.debug(`User's theme variation: ${n}`), n)) {
29 case 0:Variable 'n' should be initialized on declaration
5(() => {
6 (() => {
7 var t,
8 n, 9 e = document.body;
10 function s() {
11 return parseInt(localStorage.getItem("wcTheme") || 2);Variable 't' should be initialized on declaration
4
5(() => {
6 (() => {
7 var t, 8 n,
9 e = document.body;
10 function s() {Variable 'n' should be initialized on declaration
4005 )
4006 ) {
4007 var e,
4008 n,4009 o = i.default(this._element).closest(".nav, .list-group")[0],
4010 r = l.getSelectorFromElement(this._element);
4011 if (o) {Variable 'e' should be initialized on declaration
4004 i.default(this._element).hasClass("disabled")
4005 )
4006 ) {
4007 var e,4008 n,
4009 o = i.default(this._element).closest(".nav, .list-group")[0],
4010 r = l.getSelectorFromElement(this._element);
Description
In JavaScript, variables can be assigned during declaration, or at any point afterwards using an assignment statement. For example, in the following code, foo is initialized during declaration, while bar is initialized later.
var foo = 1;
var bar;
if (foo) {
bar = 1;
} else {
bar = 2;
}
Bad Practice
function foo() {
var bar;
let baz;
}
Recommended
function foo() {
var bar = 1;
let baz = 2;
const qux = 3;
}