Hi OpenAIhow to check a jquery function is defined

You can use the typeof operator to check if a jQuery function is defined. For example:

if (typeof jQuery.fn.myFunction === "function") {
  // myFunction is defined
} else {
  // myFunction is not defined
}

In this example, jQuery.fn.myFunction is the function you want to check if it is defined. The typeof operator will return "function" if the function is defined, and "undefined" if it is not defined.