Leafletjs: How to have new marker in first click then update the latlng of marker in second click - leaflet

Question

I have list of markers that want to render in the map, but I want it one by one. In first click I want to make new marker. Then when I click to another location, I want my marker to just move to the new latLng not to create another marker. Here is my code:
function (licon, coord, data) {
var self = jQuery(this);
var map = self.data("map");
var latlng = new L.LatLng(coord[0], coord[1]);
//Create Marker
if (licon) {
var leafIcon = L.icon(licon);
console.log(typeof (marker));
if (typeof (marker) === 'undefined') {
var marker = L.marker(latlng, {
icon: leafIcon,
"markerData": data,
draggable: true
});
} else {
console.log('not undefined');
map.removeLayer(marker);
marker = L.marker(latlng, {
icon: leafIcon,
"markerData": data,
draggable: true
});
}
} else {
var marker = L.marker(latlng, {
"markerData": data,
draggable: true
});
}
marker.addTo(map);
return marker;
}

Answer 1

A quick example of the result: http://jsfiddle.net/ve2huzxw/43/
var currentMarker;
map.on("click", function (event) {
if (currentMarker) {
currentMarker.setLatLng(event.latlng);
return;
}
currentMarker = L.marker(event.latlng, {
draggable: true
}).addTo(map).on("click", function () {
event.originalEvent.stopPropagation();
});
});
document.getElementById("done").addEventListener("click", function () {
currentMarker = null;
});
You can also add a smooth transition to show the marker moving to the new position:
if (currentMarker) {
currentMarker._icon.style.transition = "transform 0.3s ease-out";
currentMarker._shadow.style.transition = "transform 0.3s ease-out";
currentMarker.setLatLng(event.latlng);
setTimeout(function () {
currentMarker._icon.style.transition = null;
currentMarker._shadow.style.transition = null;
}, 300);
return;
}

Answer 2

a slightly more consolidated solution some years later.
var currentMarker;
map2.on('click', function(e) {
if (currentMarker){
currentMarker.setLatLng(e.latlng)
} else {
currentMarker = new L.marker(e.latlng).addTo(map2);
};
//console.log('lat, lon: ', e.latlng.lat, e.latlng.lng);
});
leaflet now defaults to smoothly dragging the point over to the new coords.