Animating point along a line with turf-along

Animates using distance along line allowing for animation speed control.

<!DOCTYPE html>
<html>
<head>
  <meta charset='utf-8' />
  <title></title>
  <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
  <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js'></script>
  <script src='https://api.tiles.mapbox.com/mapbox.js/plugins/turf/v2.0.2/turf.min.js'></script>  
  <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.css' rel='stylesheet' />
  <style>
    body { margin:0; padding:0; }
    #map { position:absolute; top:0; bottom:0; width:100%; }
  </style>
</head>
<body>

<div id='map'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoidHdlbGNoIiwiYSI6Il9pX3dtb3cifQ.YcYnsO0X2p3x0HpHPFfleg';
var map = new mapboxgl.Map({
  container: 'map',
  style: 'mapbox://styles/mapbox/streets-v8',
  center: [-122.580067, 45.548602],
  zoom: 20
});

var iPath = turf.linestring([
    [ -122.579915799999981, 45.5485545, 0.0 ], [ -122.57994530000002, 45.5485536, 0.0 ], [ -122.579944, 45.5485996, 0.0 ], [ -122.580011, 45.54860810000001, 0.0 ], [ -122.5799507, 45.5486043, 0.0 ], [ -122.579954700000016, 45.5485489, 0.0 ], [ -122.579903799999983, 45.5485489, 0.0 ]
]);

var iPathLength = turf.lineDistance(iPath, 'miles');
var iPoint = turf.along(iPath, 0, 'miles');

map.on('style.load', function () {
  map.addSource("path", {
    "type": "geojson",
    "data": iPath,
    "maxzoom": 20
  });

map.addLayer({
    "id": "path",
    "type": "line",
    "source": "path",
    "layout": {
      "line-join": "round",
      "line-cap": "round"
    },
    "paint": {
      "line-color": "#888",
      "line-width": 2
    }
  });

map.addSource("peep", {
    "type": "geojson",
    "data": iPoint,
    "maxzoom": 20
  });

map.addLayer({
    "id": "peep",
    "type": "circle",
    "source": "peep",
    "layout": {},
    "paint": {
      "circle-radius": 4
    }
  });

});
</script>

</body>
</html>

https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js

https://api.tiles.mapbox.com/mapbox.js/plugins/turf/v2.0.2/turf.min.js