PlacesUtils.js Example File

places/content/places/PlacesUtils.js
.pragma library

function prettyDistance(distance) {
    if (distance < 1000)
        return distance.toFixed(0) + "m";

    var km = distance/1000;
    if (km < 10)
        return km.toFixed(1) + "km";

    return km.toFixed(0) + "km";
}