SectionListExample.js

import React, { Component } from 'react';
import { SectionList, StyleSheet, Text, View} from 'react-native';

export default class SectionListBasics extends Component {
  render() {
    return (
      <View style={styles.container}>
        <SectionList
            sections={[
              {title: 'D', data: ['Devin']},
              {title: 'J', data: ['Jackson', 'James', 'Jillian', 'Jimmy', 'Joel', 'John', 'Julie']}
            ]}
            renderItem={({item}) => <Text style={styles.item}>{item}</Text>}
            renderSectionHeader={({section}) => <Text style={styles.sectionHeader}>{section.title}</Text>}
            keyExtractor={(item, index) => index}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    paddingTop: 22
  },
  sectionHeader: {
    paddingTop: 2,
    paddingLeft: 10,
    paddingRight: 10,
    paddingBottom: 2,
    fontSize: 14,
    fontWeight: 'bold',
    backgroundColor: 'rgba(247, 247, 247, 1.0)'
  },
  item: {
    padding: 10,
    fontSize: 18,
    height: 44
  }
})