push method in react hooks (usestate)?

When you use useState, you can get an update method for the state item: setTheArray([...theArray, newElement]); is the simplest answer but be careful for the mutation of items in theArray. Use deep cloning of array items. The problem is that setTheArray is not updating immediatly the array, inside component handleMethod you can't call theArray value. – assayag.org Feb 26 at 2:18

This is our Splunktool team suggestion ✌, we tried and its working fine

const [theArray, setTheArray] = useState(initialArray);
setTheArray(theArray => [...theArray, newElement]);

2._

const [theArray, setTheArray] = useState(initialArray);

setTheArray(oldArray => [...oldArray, newElement]);

5._

const {useState, useCallback} = React;
function Example() {
    const [theArray, setTheArray] = useState([]);
    const addEntryClick = () => {
        setTheArray(oldArray => [...oldArray, `Entry ${oldArray.length}`]);
    };
    return [
        <input type="button" onClick={addEntryClick} value="Add" />,
        <div>{theArray.map(entry =>
          <div>{entry}</div>
        )}
        </div>
    ];
}

ReactDOM.render(
    <Example />,
    document.getElementById("root")
);

6._

<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.1/umd/react-dom.production.min.js"></script>

Suggestion : 2

In this article, we'll look at how to update arrays using the React useState() hook and without the Array object's push() method. Rather than that, we'll use the spread operator. In this example, we saw how to update array state in React by using the useState hook and the Spread operator rather than the push() method that is normally used to add new elements to arrays in JavaScript. First, let's see how to use the useState() hook for creating an array state variable. You can't update the array directly without using the method returned from useState(). In our case, it's setMyArray().

1._

import React from "react";

const {
   useState
} = React;

const [myArray, setMyArray] = useState([]);

2._

myArray.push(1);

3._

setMyArray(oldArray => [...oldArray, newElement]);

Suggestion : 3

When you use useState, you can get an update method for the state item: Sometimes you can get away without using that callback form, if you only update the array in handlers for certain specific user events like click (but not like mousemove): then, when you want to add a new element, you use that function and pass in the new array or a function that will create the new array. Normally the latter, since state updates are asynchronous and sometimes batched: How to push element inside useState array React hook? Is that as an old method in react state? Or something new?

1._

const [theArray, setTheArray] = useState(initialArray);

2._

setTheArray(oldArray => [...oldArray, newElement]);

3._

setTheArray([...theArray, newElement]);

5._

<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.1/umd/react-dom.production.min.js"></script>

6._

const {useState, useCallback} = React;
function Example() {
    const [theArray, setTheArray] = useState([]);
    const addEntryClick = () => {
        setTheArray([...theArray, `Entry ${theArray.length}`]);
    };
    return [
        <input type="button" onClick={addEntryClick} value="Add" />,
        <div>{theArray.map(entry =>
          <div>{entry}</div>
        )}
        </div>
    ];
}

ReactDOM.render(
    <Example />,
    document.getElementById("root")
);

Suggestion : 4

const [theArray, setTheArray] = useState([]); const {useState, useCallback} = React; Adding a New Element to the State Array Normally, we would use the push() method for adding a new element to an array: myArray. push(1); However, with React, we need to use the method returned from useState to update the array.24-Apr-2022 Use useState([]) Hook to set state to [] and get state setter function.

Hello, everyone! In this post, we will investigate how to discover the answer to Push-Method-In-React-Hooks-Usestate using the computer language.

const [theArray, setTheArray] = useState(initialArray);

setTheArray(theArray => [...theArray, newElement]);

Suggestion : 5

then, when you want to add a new element, you use that function and pass in the new array or a function that will create the new array. Normally the latter, since state updates are asynchronous and sometimes batched: Because the only update to theArray in there is the one in a click event (one of the "discrete" events), I could get away with a direct update in addEntry: However, with React, we need to use the method returned from useState to update the array.

When you use useState, you can get an update method for the state item:

const [theArray, setTheArray] = useState(initialArray);

2._

setTheArray(oldArray => [...oldArray, newElement]);

Sometimes you can get away without using that callback form, if you only update the array in handlers for certain specific user events like click (but not like mousemove):

setTheArray([...theArray, newElement]);

5._

<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.1/umd/react-dom.production.min.js"></script>

6._

const {useState, useCallback} = React;
function Example() {
    const [theArray, setTheArray] = useState([]);
    const addEntryClick = () => {
        setTheArray([...theArray, `Entry ${theArray.length}`]);
    };
    return [
        <input type="button" onClick={addEntryClick} value="Add" />,
        <div>{theArray.map(entry =>
          <div>{entry}</div>
        )}
        </div>
    ];
}

ReactDOM.render(
    <Example />,
    document.getElementById("root")
);

Suggestion : 6

State generally refers to data or properties that need to be tracking in an application. The React useState Hook allows us to track state in a function component. To use the useState Hook, we first need to import it into our component. Since we are now tracking a single object, we need to reference that object and then the property of that object when rendering the component. (Ex: car.brand)

At the top of your component, import the useState Hook.

import {
   useState
} from "react";

Initialize state at the top of the function component.

import {
   useState
} from "react";

function FavoriteColor() {
   const [color, setColor] = useState("");
}

Use the state variable in the rendered component.

import { useState } from "react";
import ReactDOM from "react-dom/client";

function FavoriteColor() {
  const [color, setColor] = useState("red");

  return <h1>My favorite color is {color}!</h1>
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<FavoriteColor />);

Create multiple state Hooks:

import { useState } from "react";
import ReactDOM from "react-dom/client";

function Car() {
  const [brand, setBrand] = useState("Ford");
  const [model, setModel] = useState("Mustang");
  const [year, setYear] = useState("1964");
  const [color, setColor] = useState("red");

  return (
    <>
      <h1>My {brand}</h1>
      <p>
        It is a {color} {model} from {year}.
      </p>
    </>
  )
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Car />);

Create a single Hook that holds an object:

import { useState } from "react";
import ReactDOM from "react-dom/client";

function Car() {
  const [car, setCar] = useState({
    brand: "Ford",
    model: "Mustang",
    year: "1964",
    color: "red"
  });

  return (
    <>
      <h1>My {car.brand}</h1>
      <p>
        It is a {car.color} {car.model} from {car.year}.
      </p>
    </>
  )
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Car />);