How to create an if else condition with ArcGIS Javascript API for slider and imageLay

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The code below is the switch statement that I am currently using. I can't seem to get the values (case) to match up with the horizontal slider I am using (4 unique values-each layer). I was thinking of trying an if else condition instead. Anyone have the best way to accomplish this?

function setPixelFilter() { var val = slider.get("value"); switch (val) { case 0: var imageLayer = new ArcGISImageServiceLayer("https://...ImageServer") map.addLayer(imageLayer) break; case 100/3: var imageLayer = new ArcGISImageServiceLayer("https://...ImageServer") map.addLayer(imageLayer) break; case 100/3*2: var imageLayer = new ArcGISImageServiceLayer("https://...ImageServer") map.addLayer(imageLayer) break; case 100: var imageLayer = new ArcGISImageServiceLayer("https://...ImageServer") map.addLayer(imageLayer) break;

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