lodash debounce not working in anonymous function

Question

Hello I cannot seem to figure out why the debounce function works as expected when passed directly to a keyup event; but it does not work if I wrap it inside an anonymous fu

Answer 1

debounce doesn't execute the function, it returns a function with the debounciness built into it.

Returns

(Function): Returns the new debounced function.

So your #function handler is actually doing the Right Thing, by returning a function to be used by jQuery as a keyup handler. To fix your #noReturnAnonFunction example, you could simply execute the debounced function in the context of your function:

$('#noReturnAnonFunction').on('keyup', function () {
    _.debounce(debounceIt, 500, false)(); // Immediately executes
});

But that's introducing a needless anonymous function wrapper around your debounce.