[jQuery] Best way to toggle a form field value

[Andy Matthews]

I'm storing a boolean in a hidden field, and I'd like to flip it's value
when someone clicks a link. Here's the function I've got currently:
 
function toggleInput($el) {
    // get the ID of the element being passed in
    var id = $el.attr('id');
    // get form element
    var $formEl = $('input[name=' + id + ']');
    // get the current value of the selected form field
    var value = $formEl.val();
    // set the new value 
    $formEl.val(!value);
    alert(value);
}
 
I seem to recall a way to invert the value in one line, but it's eluding me
at this time. Can someone help me out?
 
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