jQuery

window.location = $("#dayAfterLink").attr("href");

$(document).keydown(function(e) {
    if (e.keyCode === 37) {
        console.log("left arrow");
    }
});

• https://tobiasahlin.com/blog/move-from-jquery-to-vanilla-javascript/
• https://putaindecode.io/articles/de-jquery-a-vanillajs/
• https://cyrilletuzi.github.io/javascript-guides/jquery-to-javascript.html
• https://gist.github.com/joyrexus/7307312
• http://youmightnotneedjquery.com