jQuery, show all elements by class name

I want to show all elements with some class name (string). Something like:

var somevar = "apple"
$( .... select all ele开发者_Go百科ments with class == somevar  ).show();

How can it be done?

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$("." + somevar).show()

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I think it should be as simple as

$('.' + somevar).show();

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$("." + somevar).show();

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$(document).ready(function(){

  var somevar = ".apple"

      $(somevar).show();

});​

That will show .apple

OR

$(document).ready(function(){

  var somevar = "apple"

      $('.' + somevar).show();

});​

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$('.'+somevar).show();