Inspired by @Jack_Franklin here's another little JS quiz.

what-is-this

function getMe() {
    console.log(this); // what is `this`?
}


var superman = {
    fname: "Clark",
    lname: "Kent"
};

getMe.call(superman); // what is `this` in getMe?


var myObj = {
    sayWhat: function() {
        console.log(this); // what is `this`?   
    }
};


$('.el').each(function() {
    console.log(this); // what is `this`?
});

function getMe() {
console.log(this); // what is this? -> window
}

var superman = {
fname: "Clark",
lname: "Kent"
};

getMe.call(superman); // what is this in getMe? -> superman

var myObj = {
sayWhat: function() {
console.log(this); // what is this? -> myObj
}
};

$('.el').each(function() {
console.log(this); // what is this? -> current iteration of $('.el')
});

It's probably just semantics (i.e. the way I'm reading it) but the jQuery iterator isn't a reference to the current jQuery Object of the .el but a reference to the DOM node itself. Unlike a lot of other jQuery methods, this actually has to be wrapped in $() to get a jQuery Object.