Use an anonymous function to protect your local symbol table. Something like: (function() { function copyArray(pa) { // Details } Function.prototype.bind = function ( po ) { __args = copyArray( arguments ); } })();

Jun 30, 2015 · You're likely trying to call the function before it is declared. Have you waited until the dom has loaded? start is a function and you redefine start holding a date? You have quite a few typos in your code as well as some naming collisions and scope issues.

Mar 13, 2025 · A variable that has not been assigned a value is of type undefined. A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned.

Mar 13, 2024 · Undefined is a global read-only variable that represents the value Undefined. Undefined is a type of primitive type. Syntax: You don’t explicitly create undefined. It’s automatically assigned to variables that lack a value: Both …

you can redeclare undefined using scope wrappers: (function($, undefined){ /* undefined is 'abc' in here */ })(jQuery, 'abc');, which is why ppl complain that it's technically not safe unless you're 100% sure you know where your code is being run.

Mar 13, 2022 · If the code that calls your JavaScript function precedes that function’s definition in your HTML document, you will come across the function is not defined error. This is very, very important to check and rule out before you proceed to investigating other probable causes.

Mar 9, 2021 · Sometimes, you may come across JavaScript function is not defined error that looks like the following: The ReferenceError as in the case above is caused when you call something that’s not defined in JavaScript. Let me show you several things you can do to fix the error.

May 6, 2024 · This error often arises in scenarios where a piece of JavaScript code attempts to invoke something that is not indeed a function. It could result from a typographical error, an uninitialized...

Sep 2, 2024 · Ever stumbled upon JavaScript errors and wondered what undefined and not defined really mean? Discover the key differences between these common issues, understand their causes, and learn how to...

Dec 18, 2019 · In some cases, this can be simply referring to a variable that isn’t defined (perhaps the most popular is when jQuery’s $ function has been dereferenced and you’re trying to use $) and simply needs a definition. Function expressions are functions that you defined through a variable keyword as follows: From the example code above, the ...