Essential Javascript

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
Found a mistake? Have a question or improvement idea? Let me know.

Feedback about page:

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

Table Of Contents