jquery .filter()

<ul>
<li>list item 1</li>
<li>list item 2</li>
<li>list item 3</li>
<li>list item 4</li>
<li>list item 5</li>
<li>list item 6</li>
</ul>
$( “li” ).filter( “:even” ).css( “background-color”, “red” );
The result of this call is a red background for items 1, 3, and 5, as they match the selector (recall that :even and :odd use 0-based indexing).
<ul>
<li><strong>list</strong> item 1 - one strong tag</li>
<li><strong>list</strong> item <strong>2</strong> -
two <span>strong tags</span></li>
<li>list item 3</li>
<li>list item 4</li>
<li>list item 5</li>
<li>list item 6</li>
</ul>
$( "li" )
.filter(function( index ) {
return $( "strong", this ).length === 1;
})
.css( "background-color", "red" );
This code will alter the first list item only, as it contains exactly one <strong> tag. Within the filter function, this refers to each DOM element in turn. The parameter passed to the function tells us the index of that DOM element within the set matched by the jQuery object.
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