Testing Inside .each() and breaking out

What I'm trying to do here is loop through a list of images with jquery .each() and test if the src that I'm passing to the function already exists inside the list. If it doesn't I want to add it, if does I don't want to do anything. Where do I put the code to add a new image baring in mind I only want to do this after the each() iterations are over

Here's what I have so far

function addFriendImage(imageSrc){ //Adds the image of the friend to the sidebar

    var imgReturn = $('ul.friendImages li img').each(function(){
        var currentImageSrc = $(this).attr('src');
        if(currentImageSrc == imageSrc){
            return false;
      开发者_如何学运维  }
    });

    if(imgReturn != false){//does this make sense?
        //I'll add an new image, (I can work out to do this bit myself)
    }
}

I'm new to javascript and jquery so I may have gone wrong with the syntax. Any feedback would be greatly appreciated.

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You can skip the loop and just find all images with the src attribute you're looking for, using the jQuery [attribute="value"] selector:

function addFriendImage(imageSrc){ //Adds the image of the friend to the sidebar

    if ($('ul.friendImages li img[src="' + imageSrc + '"]').length) {
       // img with src attribute matching imageSrc exists
    } else {
       // img doesn't exist
    }

}

You can't return values from $.each as it always returns the jQuery object for call chaining. However, returning true/false does have special meaning: Returning false behaves like a break; statement and iteration stops, while returning true behaves like a continue statement, stopping the current iteration early and continuing to the next.

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You can avoid all the extra stuff and query it directly.

if(!($('ul.friendImages li img[src=' + imageSrc + ']').length)){
}