Solution: filter(), map(), and reduce() - JavaScript Video Tutorial | LinkedIn Learning, formerly Lynda.com
![javascript - Filtering GeoJSON layer on Leaflet map based on date selected by user - Geographic Information Systems Stack Exchange javascript - Filtering GeoJSON layer on Leaflet map based on date selected by user - Geographic Information Systems Stack Exchange](https://i.stack.imgur.com/PveTD.jpg)
javascript - Filtering GeoJSON layer on Leaflet map based on date selected by user - Geographic Information Systems Stack Exchange
![Simplify your JavaScript – Use .map(), .reduce(), and .filter() | by Etienne Talbot | poka-techblog | Medium Simplify your JavaScript – Use .map(), .reduce(), and .filter() | by Etienne Talbot | poka-techblog | Medium](https://cdn-images-1.medium.com/fit/t/1600/480/1*mG4yPf0dVoBk0R6csThChQ.png)
Simplify your JavaScript – Use .map(), .reduce(), and .filter() | by Etienne Talbot | poka-techblog | Medium
![Joel Thoms 🍻 on Twitter: "💡TIP: filter and then map will loop through the array twice. This may (or may not) have a performance impact. To loop through the list one time, Joel Thoms 🍻 on Twitter: "💡TIP: filter and then map will loop through the array twice. This may (or may not) have a performance impact. To loop through the list one time,](https://pbs.twimg.com/media/EHK8M62WoAAUuCt.png)