Question

I am having a doubt of the code below

$("input").keyup(function () {
    var value = $(this).val();
    $("p").text(value);
}).keyup();

What is the use of .keyup() function at the end of the script?

Answer 1

.keyup(function () {...}) registers an eventhandler, keyup() immediately triggers the event.

explanation:

Since the keyup event writes the input-value to a separate p element, this will be triggered directly on pageload. (ty rory) This method is called chaining and a nice way to reduce code.