JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js"></script>

JavaScript

var images = {
    image1: "images/slide3.png",
    image2: "images/slide5.png",
    image3: "images/slide5.png",
    image4: "images/slide2.png",
    image5: "images/slide7.png",
    image6: "images/slide6.png",
    image7: "images/slide6.png",
    image8: "images/slide1.png",
    image9: "images/slide1.png",
    cde: "images/12.png",
    abc: "images/321.png"
}
var i = 1;
_.filter(images, function (a, b, c) {
    if ( 'image' + i == b ) {
        console.log(a);
        ++i;
    }
});