React Fundamentals

React Native is built on top of React, a popular JavaScript library for building user interfaces. React Native can be most effectively used by understanding React.

React consists of three core concepts: components, JSX, and the property state. If you want to learn more, see React’s official documentation.

This is your First Component

To illustrate this principle, we will use ‘Pet’ as an example: friendly, approachable animals that need a name and a home. Here’s your first ‘Pet’ component:

import React from ‘react’;
import { Text } from ‘react-native;
const Pet = () => {
return (
<Text>Hello, I am your pet!</Text>
);
}
export default Pet;

Output: Hello, I am your pet!

Using JavaScript’s import function, import the Text Core Component from React and React Native to define your Pet component:

import React from ‘react’;
import { Text } from ‘react-native’;

Initially, your component will be a function:

const Pet = () => {};

Components are like blueprints. The function component’s output is rendered as a React element. Using React elements, you can specify what you want to display on the screen.

In this case, the Pet component will display a <Text> element:

const Pet = () => {
return <Text>Hello, I am your pet!</Text>;
};

JavaScript’s export default allows you to export your function component for use throughout your entire app, like this:

const Pet = () => {
return <Text>Hello, I am your pet!</Text>;
};
export default Pet;

Exporting your component in this way is just one of many options.

Let’s look closely at that return statement. <Text>Hello, I am your pet! is using JSX, a JavaScript syntax that facilitates writing elements.

JSX

React and React Native use an element syntax known as JSX, which lets you write texts within JavaScript like this: <Text>Hello, I’m your pet!</Text>. The JSX syntax allows you to use variables since it is JavaScript. You are declaring a name for the pet, name, and embedding it inside of the curly braces of <Text>.

Curly Braces

Example:

import React from ‘react’;
import { Text } from ‘react-native’;
const Pet = () => {
const name = “Andrew”;
return (
<Text>Hello, I am {name}!</Text>
);
}
export default Pet;

Output: Hello, I am Andrew!

import React from ‘react’;
import { Text } from ‘react-native’;
const getFullName = (firstName, secondName, thirdName) => {
return firstName + ” ” + secondName + ” ” + thirdName;
}
const Pet = () => {
return (
<Text> Hello, I am {getFullName(“Andrew”, “Michel”, “Watson”)} </Text>
);
}
export default Pet;

Output: Hello, I am Andrew Michel Watson!

Curly braces function as a portal to JS functionality in your JSX!
React includes JSX, so if you don’t import React from ‘react’ at the top of your file, it won’t work!

Custom Components

You can nest these components inside each other in React to create new components. Nestable, reusable components are at the heart of the React paradigm.

For example, you can mix Text and TextInput together, and React Native will render them together:

import React from ‘react’;
import { Text, TextInput, View } from ‘react-native’;
const Pet = () => {
return (
<View>
<Text>Hello…</Text>
<TextInput
style={{
height: 40,
borderColor: ‘gray’,
borderWidth: 1
}}
defaultValue=” Hi there!”/>
</View>
);
}
export default Pet;

Output: Hello…
Hi there!

Props

Props, short for “properties,” let you customize React components.
Props can also be used to customize React Native’s Core Components. The following is an example of how you specify the image to be displayed when using Image:

import React from ‘react’;
import { Text, View, Image } from ‘react-native’;
Const PetApp = () => {
return (
<View>
<Image
source={{uri: “https://reactnative.sample/docs/assets/d_pet.png”}}
style={{width: 200, height: 200}}
/>
<Text>Hello, I am your pet!</Text>
</View>
);
}
export default PetApp;

Output: (Image rendered)
Hello, I am your pet!

Props and the Core Components Text, Image, and View allow you to build many things! However, if you want to build something interactive, you’ll need state.

A component should generally be configured through props when it renders. If you expect component data to change over time, keep track of it using state.

React’s use state hook allows you to add state to a component. Hooks let you access the features of React. For instance, useState adds state to functions.

import React, { useState } from “react”;
import { Button, Text, View } from “react-native”;
const Cat = (props) => {
const [isHungry, setIsHungry] = useState(true);
return (
<View>
<Text>
I am {props.name}, and I am {isHungry ? “hungry” : “full”}!
</Text>
<Button
onPress={() => {
setIsHungry(false);
}}
disabled={!isHungry}
title={isHungry ? “Pour me some milk, please!” : “Thank you!”}
/>
</View>
);
}
const Cafe = () => {
return (
<>
<Cat name=”Zeeva” />
<Cat name=”Zoe” />
</>
);
}
export default Cafe;

Output: I am Zeeva, and I am hungry!
POUR ME SOME MILK, PLEASE!
I am Zoe, and I am hungry!
POUR ME SOME MILK, PLEASE!

July 21, 2021

devadmin

Technology

49 responses to “React Fundamentals”

lovejili says:

February 1, 2026 at 4:02 pm

[8626]Lovejili Online Casino Philippines: Secure Lovejili Login, Easy Register, and App Download for the Best Slot Games. Join Lovejili Online Casino Philippines! Experience secure Lovejili login, easy Lovejili register, and Lovejili app download for the best Lovejili slot games and premium casino online action. Start winning today! visit: lovejili
vipjl says:

February 1, 2026 at 5:54 pm

[5697]Top Philippines Online Casino & Slot Games: Easy vipjl Login, Register, and Official vipjl App Download Today. Join vipjl, the top Philippines online casino for elite vipjl slot games. Experience easy vipjl login, fast vipjl register, and the official vipjl app download. Play and win big at the most trusted online gaming platform in the PH today! visit: vipjl
ph22login says:

February 1, 2026 at 7:30 pm

[5431]PH22: The Most Trusted and Legit Online Casino in the Philippines – Register & Login Today! visit: ph22login
sg8casino says:

February 1, 2026 at 9:02 pm

[5168]SG8Casino Philippines: Best Online Casino. Quick SG8Casino Login, Register, & App Download for Premium Slot Games and the Ultimate Gaming Experience. Experience SG8Casino: The Philippines’ best online casino. Fast sg8casino login, easy register, and app download for premium sg8casino slot games. Join today! visit: sg8casino
kkjili says:

February 1, 2026 at 10:34 pm

[4256]KKJILI Casino Philippines: Easy Login, Register & App Download for Top Online Slots. Experience the ultimate gaming at KKJILI Casino Philippines! Quick kkjili login and register to play top-rated kkjili slot games. Get the kkjili app download for seamless mobile casino action and start winning today. visit: kkjili
jollibee777 says:

February 2, 2026 at 12:08 am

[2059]Jollibee777: The Best Philippines Online Casino. Easy Jollibee777 login, quick register, and slot login. Download the official Jollibee777 casino apk and app for big wins today! Experience Jollibee777, the top Philippines online casino. Fast jollibee777 login, easy register, and slot login. Download the jollibee777 casino apk and app today for big wins! visit: jollibee777
365ph says:

February 2, 2026 at 1:44 am

[872]365ph Online Casino Philippines: Best Slot Games, Easy App Download, Login & Register Today! Join 365ph Online Casino Philippines for the ultimate gaming experience! Enjoy top-rated 365ph slot games with a quick 365ph login. Complete your 365ph register today and get the seamless 365ph app download for mobile play. Experience secure winning at the best 365ph online casino now! visit: 365ph
luckycalico says:

February 2, 2026 at 3:21 am

[2109]Luckycalico Login & Register: Official Casino App Download and Top Slot Games in the Philippines Experience the best luckycalico slot games! Luckycalico login and register now. Get the official luckycalico app download for a seamless luckycalico casino login. visit: luckycalico
dctcasino says:

February 2, 2026 at 5:00 am

[81]DCTCasino Philippines: Best Online Slots, Easy Login & Sign Up. Register and App Download Today! Experience the best dctcasino online slots in the Philippines! Secure your dctcasino login, complete your dctcasino register or sign up today. Get the dctcasino app download for instant access and big rewards! visit: dctcasino
jiliph says:

February 2, 2026 at 6:39 am

[2829]jiliph casino|jiliph slots|jiliph register|jiliph download|jiliph login Experience the ultimate online gaming at jiliph casino, the Philippines’ top destination for premium entertainment. Complete your jiliph register today to enjoy top-tier jiliph slots, seamless jiliph login, and the latest jiliph download for mobile play. Join now and start winning! visit: jiliph
panaloplay says:

February 2, 2026 at 8:21 am

[3802]Panaloplay: Best Philippines Online Casino – Slot Games, Easy Login, Register & App Download Experience Panaloplay, the best Philippines online casino! Enjoy top-tier Panaloplay slot games, fast Panaloplay login, and easy Panaloplay register. Get the Panaloplay app download today to play and win on the go! visit: panaloplay
phgolden says:

February 2, 2026 at 10:04 am

[2496]PHGolden Casino Philippines: Easy Login, Register & App Download for Top Slots Experience PHGolden Casino Philippines! Enjoy easy phgolden login, fast phgolden register, and phgolden app download. Play top phgolden slots and win big today. visit: phgolden
pub777 says:

February 2, 2026 at 11:44 am

[6810]PUB777 Official Site: Best Slot Online Casino in the Philippines. Easy PUB777 Login, Register & App Download for Big Wins. Join PUB777 Official Site, the top-rated slot online casino in the Philippines. Secure PUB777 login, easy PUB777 register, and fast PUB777 app download for massive wins today! visit: pub777
188jili says:

February 2, 2026 at 1:33 pm

[4173]188jili Online Casino Philippines: 188jili Login, Register, & App Download for Top 188jili Slots Experience 188jili Online Casino Philippines! Quick 188jili login, register, & 188jili app download. Play top 188jili slot games and win today. Join the best in PH! visit: 188jili
jl8787 says:

February 2, 2026 at 3:42 pm

[9934]JL8787 Login & Register: Best Online Casino and Slot Games in the Philippines | JL8787 App Download Join JL8787, the best online casino in the Philippines! Quick JL8787 login & register for top JL8787 slot games. Get the JL8787 app download & start winning today! visit: jl8787
684casino says:

February 2, 2026 at 5:49 pm

[2511]684casino Official Site: Best Online Slots Philippines – Easy Login, Register, and App Download Join 684casino official site for the best online slots Philippines. Fast 684casino login, easy 684casino register, and 684casino app download. Win big today! visit: 684casino
playphp says:

February 2, 2026 at 7:52 pm

[6976]Playphp Official Site: Secure Login, Register & App Download for the Best Philippines Online Slots. Visit Playphp Official Site for the best Philippines online slots. Secure Playphp login, easy Playphp register, and Playphp app download. Win big with Playphp slot games today! visit: playphp
okbet88 says:

February 2, 2026 at 9:52 pm

[184]OKBET88: The Leading Online Casino in the Philippines. Enjoy Premium OKBET88 Slot Games, Secure Login, Fast Registration, and Mobile App Download. Experience OKBET88 online casino, the Philippines’ top choice. Enjoy secure OKBET88 login, fast OKBET88 register, and elite OKBET88 slot games. Get the OKBET88 app download now! visit: okbet88
phswerte says:

February 2, 2026 at 11:47 pm

[290]Phswerte Online Casino Philippines: Quick Login, Easy Register, Top Slots, and App Download for the Ultimate Gaming Experience. Experience Phswerte Online Casino Philippines! Enjoy quick phswerte login, easy phswerte register, and top phswerte slots. Get the phswerte app download for the ultimate gaming experience today. visit: phswerte
bigwin29 says:

February 3, 2026 at 1:41 am

[7469]Bigwin29 Official Link: Secure Login, Register, and Play Top Slots. Download the Bigwin29 App Today for the Best Philippines Casino Experience. Access the Bigwin29 official link for secure Bigwin29 login and register. Play top Bigwin29 slot games and start the Bigwin29 app download for the best PH casino! visit: bigwin29
wjpeso says:

February 3, 2026 at 3:36 am

[2803]WJPESO: The Best Online Casino in the Philippines. Easy Login, Register & App Download for Premium Slots and Big Wins. Experience WJPESO, the best online casino in the Philippines. Secure WJPESO login and register to enjoy premium WJPESO slots and big wins. Start your WJPESO app download now for a premium gaming experience anytime, anywhere! visit: wjpeso
ph235 says:

February 3, 2026 at 5:31 am

[2825]PH235 Online Casino: Official PH235 Login, Register & App Download for Top Slots in the Philippines Join PH235 Online Casino for the best slots in the Philippines! Secure your ph235 login, ph235 register, and ph235 app download today. Access your ph235 slot login now for big wins at the official ph235 online casino. visit: ph235
jl7 says:

February 3, 2026 at 7:22 am

[6175]jl7 Casino Philippines: Easy jl7 Login, Register & App Download for Top jl7 Slot Games. Experience the best of JL7 Casino Philippines! Enjoy easy jl7 login, fast jl7 register, and top-tier jl7 slot games. Get the jl7 app download now for the ultimate jl7 casino thrill and start winning today! visit: jl7
66win says:

February 3, 2026 at 9:18 am

[3498]66win: The top online casino in the Philippines. Access the official 66win casino link for 66win login, 66win register, and 66win app download to enjoy the best 66win slot online experience. Join 66win, the top online casino in the Philippines. Use the official 66win casino link for fast 66win login and 66win register. Get the 66win app download to enjoy the best 66win slot online games and premium rewards today! visit: 66win
phjoin says:

February 3, 2026 at 11:12 am

[2983]Phjoin Online Casino: Easy Phjoin Login, Register, & App Download for Premium PH Slots Experience Phjoin Online Casino! Quick Phjoin login, easy register, and Phjoin app download for premium PH slots. Join the best Phjoin online casino and win big! visit: phjoin
luckyph says:

February 3, 2026 at 1:12 pm

[7607]LuckyPH Online Casino Philippines: Register & Login to Play Top LuckyPH Slots. Get the LuckyPH App Download for Premium Gaming and Big Wins! Join LuckyPH Online Casino Philippines! Access your LuckyPH login or LuckyPH register to play top LuckyPH slots. Get the LuckyPH app download for big wins today! visit: luckyph
lol646 says:

February 3, 2026 at 3:21 pm

[7059]Experience the best lol646 online casino in the Philippines. Quick lol646 login, register, and lol646 app download to enjoy premium lol646 slot games today! Experience the best lol646 online casino in the Philippines! Enjoy a quick lol646 login and lol646 register process to play premium lol646 slot games. Get the lol646 app download today for a seamless mobile gaming experience and exclusive rewards! visit: lol646
PlayMojo says:

February 3, 2026 at 5:27 pm

[9469]PlayMojo Philippines: PlayMojo Login & Register for Top Online Slots, Casino Bonuses, and App Download. Join PlayMojo Philippines! Quick PlayMojo login & register to access top PlayMojo online slots. Claim a huge PlayMojo casino bonus & get the PlayMojo app download now! visit: PlayMojo
crazywin says:

February 3, 2026 at 7:24 pm

[7339]Crazywin Online Casino Philippines: Top Slots, Easy Login, Register & App Download Join Crazywin Online Casino Philippines for the best crazywin slots! Enjoy a fast crazywin login and easy crazywin register process. Start winning today with the crazywin app download for a premium mobile gaming experience. visit: crazywin
nustaronline says:

February 3, 2026 at 9:19 pm

[1773]Experience the Best Online Casino in the Philippines at Nustar Casino Cebu visit: nustaronline
deskgame says:

February 3, 2026 at 11:12 pm

[2746]Deskgame Official: Secure Login, Register & App Download for the Best Philippines Slots. Join Deskgame Official for the ultimate Philippines slots experience! Access secure deskgame login, easy deskgame register, and the deskgame app download for premium casino gaming and big wins today. visit: deskgame
lvbet says:

February 4, 2026 at 1:08 am

[5689]LVBET Philippines: Best Online Slots & Casino Bonus. Easy LVBET Login, Register & App Download. Experience the best LVBET slots and casino bonus in the Philippines! Enjoy easy LVBET login, register, and LVBET app download. Join PH’s top online casino today! visit: lvbet
acesuper says:

February 4, 2026 at 3:03 am

[5435]AceSuper Login & Register: The Best Online Slots and Casino App Download in the Philippines. Join AceSuper, the premier online slots destination in the Philippines! Quick AceSuper login & register access. Get the AceSuper app download for a seamless casino login experience and big wins today. visit: acesuper
pagcor says:

February 4, 2026 at 4:56 am

[5354]The Philippines’ Most Trusted PAGCOR Licensed Online Casino & Legal Gambling Site visit: pagcor
fb777 says:

February 4, 2026 at 6:49 am

[8298]fb777 Login & Register: Top Philippines Online Casino, App Download & Premium Slots Join fb777, the top Philippines online casino! Quick fb777 login & fb777 register for premium fb777 slot games. Secure fb777 app download & fb777 casino login. Start winning today! visit: fb777
aaajili says:

February 4, 2026 at 8:46 am

[1340]Aaajili Casino Philippines: Official Aaajili Login, Register & App Download for Top Online Slots. Join Aaajili Casino Philippines for top aaajili slots! Fast aaajili login, easy aaajili register, and official aaajili app download. Experience the best aaajili casino games and win big today! visit: aaajili
jilihost says:

February 4, 2026 at 10:43 am

[4949]jilihost register|jilihost download|jilihost login|jilihost app|jilihost slots Experience the ultimate online casino in the Philippines with jilihost! Complete your jilihost register and jilihost login to enjoy top-tier jilihost slots. For seamless gaming anywhere, get the jilihost download and install the jilihost app today for big wins and exciting rewards. visit: jilihost
777perya says:

February 4, 2026 at 12:52 pm

[9991]777perya Online Casino Philippines: Easy Login, Register & App Download for the Best Slot Games. Join 777perya Online Casino Philippines! Experience easy 777perya login, fast register, and the official app download for top-tier slot games. Play and win today! visit: 777perya
nowbet says:

February 4, 2026 at 3:08 pm

[5797]Nowbet Casino Philippines: Top Online Slots, Easy Login, Register & App Download. Experience top-tier gaming at Nowbet Casino Philippines! Fast nowbet login & easy nowbet register for the best nowbet slot titles. Use the nowbet download app today! visit: nowbet
365jl says:

February 4, 2026 at 5:13 pm

[6281]365jl Official Link: Fast 365jl Login, Register & App Download for Top 365jl Slot Games in the Philippines. Join 365jl, the top online casino in the Philippines! Use our 365jl official link for fast 365jl login, easy 365jl register, and 365jl app download. Experience premium 365jl slot games and start winning big today! visit: 365jl
pg777 says:

February 4, 2026 at 7:04 pm

[4949]PG777: The Best Legit Online Casino Philippines – Play Real Money Slot Games with Easy GCash Payouts. Experience PG777, the best legit online casino Philippines. Play real money slot games with fast GCash payouts. Secure your PG777 slot games login today and win big at the most trusted real money casino in the PH! visit: pg777
500jl says:

February 4, 2026 at 8:51 pm

[1859]500jl Casino Philippines: Official Login & Register – Play Top Slots & Download the 500jl App Now. Join 500jl Casino Philippines for top-tier gaming! Secure your 500jl login or 500jl register today to play premium 500jl slot games. Download the 500jl app and start winning now! visit: 500jl
c9taya says:

February 4, 2026 at 10:40 pm

[8775]C9TAYA Online Casino Philippines: Best Slot Games, Easy Login, Register, & App Download Experience the best C9TAYA Online Casino Philippines! Enjoy top c9taya slot games, easy c9taya login, and quick c9taya register. Get the c9taya app download and win today! visit: c9taya
MWCAH says:

February 5, 2026 at 12:27 am

[2897]MWCAH Online Casino Philippines: Easy MWCAH Login, Register, Slots & App Download Join MWCAH Online Casino Philippines for the ultimate gaming experience. Enjoy easy MWCAH login, fast MWCAH register, premium MWCAH slot games, and a seamless MWCAH app download. Start winning today! visit: MWCAH
pisso789 says:

February 5, 2026 at 2:13 am

[1671]Pisso789: Top Philippines Online Slot & Casino. Easy Pisso789 Login, Fast Daftar Pisso789, and Download Pisso789 APK for the Best Pisso789 Gacor Experience and Big Wins. Join Pisso789, the top Philippines online casino. Enjoy easy Pisso789 login, fast daftar Pisso789, and download Pisso789 APK for the best Pisso789 gacor slot wins! visit: pisso789
win444telegram says:

February 26, 2026 at 6:26 am

For all you Telegram users out there, win444telegram is where it’s at! Join their channel and stay updated on all the cool promos and game nights. Trust me, you won’t regret it!
xsvlminhngoc says:

February 26, 2026 at 6:27 am

Yo, lottery fans, I’ve been checking xsvlminhngoc lately for the results. Always reliable and up-to-date. Good luck to everyone!
arenapluspc says:

February 26, 2026 at 6:27 am

Alright, alright, arenapluspc. Gave this a shot after seeing it pop up everywhere. Interface is pretty slick and the variety of options is solid. Think I’ll be back, especially if they keep the promos coming! Find out more arenapluspc
yo68 says:

March 1, 2026 at 6:56 am

[5118]yo68 Login & Register: Best Online Slots, Casino App Download & Bonus Code Philippines Join yo68, the Philippines’ top online casino! Register or login now to play the best online slots. Download our casino app and use the exclusive bonus code to start winning big today! visit: yo68

DEVtrust