How do you create a jQuery plugin?

<p class="a">One</p><p class="a">Two</p>

$.fn.markAs = function (options) {
  var settings = $.extend({ label: 'done' }, options);
  return this.each(function () {
    $(this).addClass(settings.label);
  });
};

$('.a').markAs({ label: 'checked' });

See jQuery Plugins.

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