Append/push array into array in JavaScript

Today, We want to share with you javascript push array into array.In this post we will show you 5 Way to Append Item to Array in JavaScript, hear for JavaScript Array Insert – How to Add to an Array with the Push, Unshift, and Concat Functions we will give you demo and example for implement.In this post, we will learn about Array push key value pair Dynamically in javascript with an example.

JavaScript Array push() Method

Example 1: index.html

<!DOCTYPE html>
<html>
<body>

<p>Click the button to add new elements to the array.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
var members = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = members;

function myFunction() {
  members.push("Kiwi", "Lemon", "Pineajay");
  document.getElementById("demo").innerHTML = members;
}
</script>

</body>
</html>

Example 2: Copy array items into another array

var arrayA = [1, 2];
var arrayB = [3, 4];
var newArray = arrayA.concat(arrayB);

Example 3:

const arr = ['First item', 'Second item', 'Third item'];

arr.push('Fourth item');

console.log(arr); // ['First item', 'Second item', 'Third item', 'Fourth item']

Example 4:

const arr = ['First item', 'Second item', 'Third item'];

const arrLength = arr.push('Fourth item', 'Fifth item');

console.log(arrLength); // 5 
console.log(arr); // ['First item', 'Second item', 'Third item', 'Fourth item', 'Fifth item']

Example 5:

const arr = ['First item', 'Second item', 'Third item'];

const arrLength = arr.unshift('Urgent item 1', 'Urgent item 2');

console.log(arrLength); // 5 
console.log(arr); // ['Urgent item 1', 'Urgent item 2', 'First item', 'Second item', 'Third item']

Example 6: javascript pushing to an array

some_array = ["John", "Sally"];
some_array.push("Mike");

console.log(some_array); //output will be =>
["John", "Sally", "Mike"]

Example 7: how to append object in array javascript?

var select =[2,5,8];
var filerdata=[];
for (var i = 0; i < select.length; i++) {
  filerdata.push(this.state.data.find((record) => record.id == select[i]));
}

Example 8: add an element to an array javascript

var members = ["Banana", "Orange", "Apple", "Mango"];

members.push("Kiwi"); 

Example 9: what does results.push({}) nodejs mean

const mongoose = require('mongoose');
    var data = async function () {
         var array = [];
         const finalResults = await new Promise((resolve, reject) => {
            mongoose.connection.collection("organizations").find({}).toArray(function(err, result) {
              resolve(result);
           });
      });

     for(var i = 0; i < finalResults.length; i++)
     {
          var a = finalResults[i].name;
           array.push(a);
      }
        return array;
    };

    module.exports = {
        data: data,
    };

Example 10: js array add element

array.push(element)

Example 11: javascript append to array

var colors=["red","white"];
colors.push("blue");//append 'blue' to colors

I hope you get an idea about push array to array javascript.
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