Change ID to text in paragraph with jQuery and Replace spaces with underscores

I would like to take what text is in my p tag and make that the p tags parent (div) that ID. I would also like to add a _ for any spaces in the p tag.


<div class="circle"><p>Apple</p></div>
<div class="circle"><p>Banana</p></div>
<div class="circle"><p>Carrot Juice</p></div>


<div id="Apple" class="circle"><p>Apple</p></div>
<div id="Banana" class="circle"><p>Banana</p></div>
<div id="Carrot_Juice" class="circle"><p>Carrot Juice</p></div>


$(' p').each(function() {
    $(this).parent('div').attr('id', $(this).text().replace(/ /g,'_'));

jsFiddle example

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