Change building color based on zoom level | NMaps GL JS Docs

Use the interpolate expression to ease-in the building layer and smoothly fade from one color to the next.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Change building color based on zoom level</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://cdn.ndrive.com/nmapsgl/v.1.6.8/nmaps-gl.js"></script>
<link href="https://cdn.ndrive.com/nmapsgl/v.1.6.8/nmaps-gl.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#zoom {
display: block;
position: relative;
margin: 20px auto;
width: 50%;
height: 40px;
padding: 10px;
border: none;
border-radius: 3px;
font-size: 12px;
text-align: center;
color: #fff;
background: #ee8a65;
}
</style>
<div id="map"></div>
<button id="zoom">Zoom to buildings</button>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST ADD YOUR ACCESS TOKEN
	nmapsgl.accessToken = '<your access token here>';
	
const map = new nmapsgl.Map({
container: 'map',
style: 'Streets',
center: [-90.73414, 14.55524],
zoom: 13
});
 
map.on('load', () => {
map.setPaintProperty('polygon_building', 'fill-color', [
'interpolate',
['exponential', 0.5],
['zoom'],
15,
'#e2714b',
22,
'#eee695'
]);
 
map.setPaintProperty('polygon_building', 'fill-opacity', [
'interpolate',
['exponential', 0.5],
['zoom'],
15,
0,
22,
1
]);
});
 
document.getElementById('zoom').addEventListener('click', () => {
map.zoomTo(19, { duration: 9000 });
});
</script>
 
</body>
</html>