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What does ' + next + ' do??

in Using jQuery • 7 years ago

I have come across the following functions that use the scrollTo plugin to move to a random image but don't understand the part of the line: .scrollTo('#pic_scroller>img:eq(' + next + ')', {duration: 1000}); that I have highlighted. - the ' + next + ' part.

The full function is below. Can do a full jsfiddle if really necessary but hoping someone will know what the parameter is doing without needing to do that.

$(document).ready(function(){

$('#pic_container').click(function(){

var numberOfPics = $(this).find('div > img').length;

var last = $(this).data('last');

var next = Math.floor(Math.random() * numberOfPics);

if(next == last) {

next = (next + 1) % numberOfPics;

}

$(this)

.data('last', next)

.scrollTo('#pic_scroller>img:eq(' + next + ')', {duration: 1000});

});