How to get arrays inside an array Javascript
Get Array Inside an Array in Javascript, How to fetch an array inside Javascript complete explained
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In JavaScript, arrays can contain other arrays, creating a multi-dimensional array or an array of arrays. To access elements inside an array of arrays, you use multiple bracket notation. Hereโs a guide on how to get and manipulate arrays inside an array:
1. Creating an Array of Arrays
You can create an array of arrays by nesting arrays within a main array:
let arrayOfArrays = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ];
2. Accessing Elements in an Array of Arrays
To access elements inside an array of arrays, use bracket notation twice: the first bracket to access the nested array, and the second to access the element within that nested array.
Access a Nested Array:
let firstArray = arrayOfArrays[0]; // [1, 2, 3] let secondArray = arrayOfArrays[1]; // [4, 5, 6]
Access an Element in a Nested Array:
let firstElement = arrayOfArrays[0][0]; // 1 let secondElement = arrayOfArrays[1][2]; // 6
3. Iterating Over an Array of Arrays
You can use nested loops to iterate over an array of arrays.
Using for
Loop:
for (let i = 0; i < arrayOfArrays.length; i++) { for (let j = 0; j < arrayOfArrays[i].length; j++) { console.log(arrayOfArrays[i][j]); } }
Using forEach
Loop:
arrayOfArrays.forEach(innerArray => { innerArray.forEach(element => { console.log(element); }); });
4. Adding Elements to an Array of Arrays
You can add elements to both the main array and the nested arrays.
Add a New Nested Array:
arrayOfArrays.push([10, 11, 12]); console.log(arrayOfArrays); // Output: [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
Add an Element to an Existing Nested Array:
arrayOfArrays[0].push(0); console.log(arrayOfArrays[0]); // Output: [1, 2, 3, 0]
5. Removing Elements from an Array of Arrays
You can remove elements using methods like pop
, shift
, or splice
.
Remove a Nested Array:
let removedArray = arrayOfArrays.pop(); console.log(removedArray); // [10, 11, 12] console.log(arrayOfArrays); // Output: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Remove an Element from a Nested Array:
let removedElement = arrayOfArrays[0].pop(); console.log(removedElement); // 0 console.log(arrayOfArrays[0]); // Output: [1, 2, 3]
Example Usage
Here is an example that demonstrates various operations on an array of arrays:
let arrayOfArrays = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ]; // Access elements console.log(arrayOfArrays[1][1]); // 5 // Iterate over array of arrays arrayOfArrays.forEach(innerArray => { innerArray.forEach(element => { console.log(element); }); }); // Add elements arrayOfArrays.push([10, 11, 12]); arrayOfArrays[0].push(0); // Remove elements arrayOfArrays.pop(); arrayOfArrays[0].pop(); console.log(arrayOfArrays);
Accessing and manipulating arrays inside an array in JavaScript is straightforward using bracket notation.