Duplicate Parameters

suggest change

Strict mode does not allow you to use duplicate function parameter names.

function foo(bar, bar) {}  // No error. bar is set to the final argument when called

"use strict";
function foo(bar, bar) {}; // SyntaxError: duplicate formal argument bar

Feedback about page:

Feedback:
Optional: your email if you want me to get back to you:


Strict mode:
* Syntax
* Duplicate Parameters

Table Of Contents
11 Arrays
12 Objects
14 Classes
16 Map
17 Set
24 Loops
27 Date
29 Scope
30 AJAX
35 Cookies
39 Strict mode
41 JSON
44 Fetch
45 Modules
46 Screen
64 Console
68 Symbols
73 Modals
76 Events
86 Proxy
89 WeakMap
90 WeakSet
102 Tilde