Generate Google Maps place shareable link.

google-maps-place-share-link.js

// https://stackoverflow.com/a/6420040/2732184

if (!String.prototype.format) {
    String.prototype.format = function (args) {
        var newStr = this;
        for (var key in args) {
            newStr = newStr.replace('{' + key + '}', args[key]);
        }
        return newStr;
    };
}

// https://stackoverflow.com/questions/37893131/how-to-convert-lat-long-from-decimal-degrees-to-dms-format

function toDegreesMinutesAndSeconds(coordinate) {
    var absolute = Math.abs(coordinate);
    var degrees = Math.floor(absolute);
    var minutesNotTruncated = (absolute - degrees) * 60;
    var minutes = Math.floor(minutesNotTruncated);
    var seconds = Math.floor((minutesNotTruncated - minutes) * 60);

    return degrees + "°" + minutes + "'" + seconds + "\"";
}

function convertDMS(lat, lng) {
    var latitude = toDegreesMinutesAndSeconds(lat);
    var latitudeCardinal = lat >= 0 ? "N" : "S";

    var longitude = toDegreesMinutesAndSeconds(lng);
    var longitudeCardinal = lng >= 0 ? "E" : "W";

    return latitude + latitudeCardinal + "+" + longitude + longitudeCardinal;
}

function getGmapLink(uri, lat, lng) {
    var dms = convertDMS(lat, lng);
    var link = uri.format({
        dms: dms, 
        lat: lat, 
        lng: lng
    });
    return encodeURI(link);
}

var uri = "https://www.google.com/maps/place/{dms}/@{lat},{lng},10z";

var lat = -1.37279;

var lng = 36.6517053;

var link = getGmapLink(uri, lat, lng);

console.log(link);

// https://www.google.com/maps/place/1%C2%B022'22%22S+36%C2%B039'6%22E/@-1.37279,36.6517053,10z