React Props complete guide for beginners

Table of Content

📌 Introduction

📌 React Props

📌 Pro Tips

➡ Reduce JSX Redundancy

➡ Communicate between Parent and Child

➡ Triangular communication between Parent and Components

📌 Thank you

Introduction

Hello amazing developer 🧑‍💻, before digging into this topic let me give you a small introduction and so instructions. Don't worry it would be quick and crisp.

I am Suchintan Das, a Full Stack Developer currently working over two startups. I have been into web development for past two years.

Connect me on 👉 Linkedin

The whole syntaxes and code are uploaded on this 👉 Repository . If you find it useful , you can star the repository to show a appreciation. Thanks !

React Props

I know most of you can't wait to know what's there on this amazing blog but let's just take a small breath understand a little bit about React Props

It's very similar to inheritance where some properties are passed from parent to child. Yes, in case of props also it's a one-way path.

Pro Tips

Reduce JSX Redundancy

Yes, you heard it write , you can actually send JSX to your child like any card body, section body or headings . Here's a small example of it.

Parent.jsx


import React from "react";
import Children from "./Children";
import "../../stylesheets/Part1/Parent.css"

const Parent = () => {
  const card = (title) => (
    <div className="card">
      <img
        src="https://i2.wp.com/sleepingshouldbeeasy.com/wp-content/uploads/2019/12/gross-motor-activities-for-1-year-olds-3.jpg"
        alt=""
      />
      <button>{title}</button>
    </div>
  );
  return (
    <>
      <div className="container">
        <h1>Showing childrens</h1>
        <br />
        <div className="cards">
        <Children childcard={card("Child")} />
        </div>
      </div>
    </>
  );
};

export default Parent;

Children.jsx


import React from 'react'

const Children1 = (props) => {
  return (
    props.childcard
  )
}

export default Children1

The card is defined in the parent component and it sent it to child component to use , which reduces the reductant code in the first place taking reusable components to another level.

Communicate between Parent and Child

I know most of the people while working over any website comes through a scenario where they want to get changes in parent based on changes on child component. Here's an example, let us take you are building a website with dark and light mode switching and you put the controller on the parent body and the child component section.

The idea here is using pointers !

Yes, you heard it right !

We know that the communication of props is a one-way process so after the props are sent there is no returning back of it even if there are some changes that occurred. To solve this issue we will send our states pointer to the child. Therefore any change in the value would mean change on the pointers address which would help use manipulate parent and child together. YES 😉!

Here's a small code peak -

Parent.jsx


import React, { useState } from "react";
import "../../stylesheets/Part2/Parent.css";
import Children from "./Children";

const Parent = () => {
  const [dark, setdark] = useState(false);

  const tooglemode = () => {
    dark ? setdark(false) : setdark(true);
  };

  const darkmode = (
    <i
      className={
        !dark
          ? "fa-solid fa-moon toogle-active"
          : "fa-solid fa-moon toogle-inactive"
      }
      onClick={tooglemode}
    />
  );

  const lightmode = (
    <i
      className={
        dark
          ? "fa-solid fa-sun toogle-active"
          : "fa-solid fa-sun toogle-inactive"
      }
      onClick={tooglemode}
    />
  );

  return (
    <div className={dark ? "application dark" : "application light"}>
      <div className="buttoncontroller">
        <h1>Website</h1>
        <div className="toogle">
          {darkmode}
          {lightmode}
        </div>
      </div>
      <Children dark tooglemode={tooglemode} />
    </div>
  );
};

export default Parent;

Children.jsx


import React from "react";
import illustrator from "../../assets/images/illustrator.svg";

const Children = ({ dark, tooglemode }) => {
  return (
    <div className="section">
      <img src={illustrator} alt="" />
      <div className="sidebar">
        <h1>Welcome</h1>
        <p>
          Lorem ipsum dolor sit amet consectetur adipisicing elit. Cupiditate
          quod cum quibusdam rerum quis repellat consequuntur nesciunt deserunt.
          Voluptates aut eaque sed rerum dolorem alias quia! Quo magni hic odio
          exercitationem ratione.
        </p>
        {dark ? (
          <button
            onClick={tooglemode}
            className="light"
            style={{ border: "2px solid black" }}
          >
            Dark Mode
          </button>
        ) : (
          <button onClick={tooglemode} className="dark">
            Light Mode
          </button>
        )}
      </div>
    </div>
  );
};

export default Children;

And a short demonstration of the same-

Triangular communication between Parent and Components

Yes I know that's something very exciting. Though the concept would remain same as earlier the only play here is that all the states that needs to be manipulated would be defined on the Parent Component and their pointers would be sent to all the childs. As a change is done on the pointer's address all the components would be accessing the data from the same address result being passed on all the 3 of them.

Let's have our peak on the code -

Parent.jsx


import React, { useState } from "react";
import "../../stylesheets/Part3/Parent.css";
import Children1 from "./Children1";
import Children2 from "./Children2";

const Parent = () => {
  const [show, setshow] = useState(true);
  const [count, setcount] = useState([1]);

  const toogle = () => {
    show ? setshow(false) : setshow(true);
  };

  const maintaincount = (event) => {
    event.target.id === "add"
      ? setcount([...count, count[count.length] + 1])
      : setcount(count.slice(0, -1));
  };

  return (
    <div className="application-container">
      <div className="header">
        <button onClick={maintaincount} id="add">
          Add
        </button>
        <button onClick={maintaincount} id="delete">
          Delete
        </button>
      </div>
      <div className="section-application">
        <Children1 show toogle={toogle} />
        <Children2 count={count} show />
      </div>
    </div>
  );
};

export default Parent;

Children1.jsx


import React from 'react'

const Children1 = ({toogle}) => {

  return (
    <div className="section1">
        <h1>Control Text Visibility</h1>
        <button onClick={toogle}>Toggle</button>
    </div>
  )
}

export default Children1

Children2.jsx


import React from "react";

const Children2 = (props) => {
  console.log(props.show);
  return (
    <div className="section2">
      {props.show ? (
        props.count.map((ele) => {
          return (
            <div className="section2-application" key={ele}>
              <h1>Sample Text</h1>
              <p>
                Lorem, ipsum dolor sit amet consectetur adipisicing elit. Iure,
                ratione necessitatibus officia asperiores quia quaerat
                aspernatur est dignissimos corrupti ullam qui sapiente dolorum
                aliquid!
              </p>
            </div>
          );
        })
      ) : (
        <div>Activate show to view the list</div>
      )}
    </div>
  );
};

export default Children2;