How to append data to elements attribute value

Question

Having htmls like this,

<a class="testDiv" href="/link1"></a>
<a class="testDiv" href="/link2"></a>

I'm trying to append ?param1=2 to the href attributes of all <a> tags.

So that it should look like,

<a class="testDiv" href="/link1?param1=2"></a>
<a class="testDiv" href="/link2?param1=2"></a>

Something like this,

$(".testDiv").attr('href').append("?param1=2");

Is there any possible way for this?

Answer 1

$(".testDiv").attr('href', function (_, currentHref) {
    return currentHref +"?param1=2"
});