React Native List Map

We cannot store a duplicate pair in the map (). We assign the new array returned by map () to the variable doubled and log it: Generally, you'll want to use either flatlist or sectionlist.

To do so, first start by writing some code to build a custom component, like so: The minimal api is to create a listview.datasource, populate it with a flat array of data blobs, and instantiate a listview component with that data source and a renderrow callback which takes a blob from the data array and returns a. The value stored in the map must be mapped to the key.

We will import list in our home component and show it on screen.

This article goes in detailed on map function example in react native. Flatlist works well for long lists of data, where the number of items might change over time. It is because of the uniqueness of each stored key. In this chapter, we will show you how to create a list in react native.