Use of deferreds and pipe

deferreds_pipe

fetchCurrentPosition()
	.then(updateLocationDisplay)
	.pipe(fetchWeatherAtThisLocation)
		.then(updateWeatherDisplay)
		.pipe(determineWeatherType)
			.then(updateRecommendations)
			.then(updateAppTile);

function fetchCurrentPosition()
{
	return $.Deferred( function( deferred ) {
		navigator.geolocation.getCurrentPosition(
			deferred.resolve, deferred.reject
		);
	}).promise();
}