How to make a boolean variable switch between true and false every time a method is invoked?

Question

I am trying to write a method that when invoked, changes a boolean variable to true, and when invoked again, changes the same variable to false, etc.

For example: ca

Answer 1

var logged_in = false;
logged_in = !logged_in;

A little example:

var logged_in = false;


$("#enable").click(function() {
    logged_in = !logged_in;
    checkLogin();
});

function checkLogin(){
    if (logged_in)
        $("#id_test").removeClass("test").addClass("test_hidde");
    else
        $("#id_test").removeClass("test_hidde").addClass("test");
    $("#id_test").text($("#id_test").text()+', '+logged_in);
}

.test{
    color: red;
    font-size: 16px;
    width: 100000px
}

.test_hidde{
    color: #000;
    font-size: 26px;
}

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