What does the anonymous function passed into the off function mean?

Question

What does the anonymous function passed into the off function mean?

For instance, what does the following mean:

$jqueryEl.off("click", function() { console.log("When will it be called?"); });.

Will the function() { console.log("When will it be called?"); be called once all the click listeners are removed or will it be called instead of the removed click listeners?

I am asking this since there is no clear answer to this in the documentation:

A handler function previously attached for the event(s), or the special value false.

Answer 1

What does the anonymous function passed into the off function mean?

Nothing useful.

Since it is a function expression, it will generate a new function. Therefore it can't have been previously attached for the event.

It also isn't false.

Whoever wrote that code made an error.

---

Typically this happens when someone intended to conditionally remove the function:

const myHandler = function() { console.log("When will it be called?"); };

$jqueryEl.on("click", myHandler);

$somethingElse.on("click", function () {
    $jqueryEl.off("click", myHandler);
});

… but when they have created two identical functions, instead of reusing the same function for the two different calls.