Question

when I’m looking for some sites Javascript code, I see this

function hrefLeftMenu() {
    var x = true;
    for (i in info) {
        $(".leftmenu ul").append("<li" + (x ? " class='active'" : "") + " onclick='openAnInfo(\"" + i + "\", this);'> - " + info[i].title + "</li>");
        x = x??!x;
    }
    openAnInfo("0", ".lelelesakineyy");
}

What it does in javascript? Why the coder’s used this operator?

Thanks.

Answer 1

I think it is a mistake. They’re generating a menu and x is used to set an item as active, and it looks like they want to default to selecting the first item. They want x to be true the first time around, and then false for the rest. It was probably supposed to be something like

x = x?!x:x; // If first time through, then set x = false for the rest

aka

x = false; // Set x = false for the rest

but confusion/muddy thinking led to over-complification.