renderItem={({item}) => {txttanyidea} }

renderItem={({item})=><Text>{item}</Text>}

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

const txttanyidea = '<text>{item}</text>';

export default class SectionListBasics extends Component {
  render() {
    return (
      <View>
    <SectionList
      sections={[
        {data: ['Devin']},
        {data: ['JacKson', 'Jimmy', 'Joel', 'John', 'JUlie']}, ]}
        renderItem={({item})=><Text>{item}</Text>}
     // renderItem={({item}) => {txttanyidea} }
    />
      </View>
    );
  }
}


// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => SectionListBasics);