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How to find and render object in Array using React.js - LearnShareIT

How to find and render object in Array using React.js

Find and render Object in Array using React.js

This article will cover several ways to find and render object in Array using React.js, like using Array.find() or Array.filter() method. Let’s read it now.

Find and render object in array using React.js 

First, we need to find and render an object in Array like the Array shown below.

Code:

const userArray = [
    { id: 1, name: "Tom" },
    { id: 2, name: "Jimmy" },
];

For example, we have a simple nest Array to hold the users, so how do we retrieve a particular object from the above Array? Check out the ways introduced below to see how to do it.

Using array.filter() method

Filter in Javascript is a method of an array object. It has the correct meaning of its name. That is, it will loop through the elements, then, depending on the problem, it will decide whether to choose that element. Finally, this function will return an array of selected elements.

This way, we only need to give a conditional statement, such as checking the id is 1. It will render to the screen like the code below, and we will get the object we need to find in the Array.

Code:

import React from "react";

const App = () => {
  const userArray = [
    { id: 1, name: "Tom" },
    { id: 2, name: "Jimmy" },
  ];
 
  return (
    <>
      <h2>Find and render Object in Array using React.js | LearnShareIT</h2>
      <hr />
      <h3>
        {JSON.stringify(
          userArray.filter((element) => {
            return element.id === 1;
          })
        )}
      </h3>
    </>
  );
};
 
export default App;

Output:

So we can find the object from a nested array with an id equal to 1 simply using Array. filter(), or refer to the below method for more information in React.

Using array.find() method

The find function will execute the test function in turn using the elements of the Array until the value is met and the test function returns true. Then the find function will return the value of the matching element and skip checking the remaining elements. By replacing the filter in the above method with Array.find(), we can also find the object we are looking for.

Code:

import React from "react";

const App = () => {
  const userArray = [
    { id: 1, name: "Tom" },
    { id: 2, name: "Jimmy" },
  ];
 
  return (
    <>
      <h2>Find and render Object in Array using React.js | LearnShareIT</h2>
      <hr />
      <h3>
        {JSON.stringify(
          userArray.find((element) => {
            return element.id === 1;
          })
        )}
      </h3>
    </>
  );
};
 
export default App;

However, this approach will have limitations with such properties if you look for multiple objects with the same condition. So you need to be careful when using this method, good luck with these two methods.

Summary

In summary, this article has shown you how to find and render objects in Array using React.js, but you should use Array. filter() method to find more diverse objects. Good luck for you.

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