Require let or const instead of var
Cette page n'est pas encore disponible en français, sa traduction est en cours.
Si vous avez des questions ou des retours sur notre projet de traduction actuel,
n'hésitez pas à nous contacter.
ID: javascript-code-style/no-var
Language: JavaScript
Severity: Notice
Category: Best Practices
Description
Block scoped lexical declarations like let and const are preferred over var. Block scope is common in many other programming languages and helps programmers avoid mistakes.
Non-Compliant Code Examples
var foo = bar;
var foo = bar, toast = most;
var foo = bar; let toast = most;
for (var a of b) { console.log(a); }
for (var a in b) { console.log(a); }
for (let a of b) { var c = 1; console.log(c); }
for (var i = 0; i < list.length; ++i) { foo(i) }
for (var i = 0; i < 10; ++i) {};
for (var a of b) { arr.push(() => a); }
for (let a of b) { var c; console.log(c); c = 'hello'; }
var a = a;
var {a = a} = {};
var {a = b, b} = {};
let {a, b = a} = {};
var a = b, b = 1;
let a = b; var b = 1;
function foo() { a } var a = 1; foo();
if (foo) var bar = 1;
var foo = 1;
{ var foo = 1 }
if (true) { var foo = 1 }
var foo = 1;
declare var foo = 2;
function foo() { var let; }
function foo() { var { let } = {}; }
function foo() { a }
var a = 1; foo();
Compliant Code Examples
const JOE = 'schmoe';
let moo = 'car';
const JOE = 'schmoe';
let moo = 'car';
