How to usea Loop in Javascript
In this approach, we are using nested loops to iterate over the rows and columns of the 2D array and initialize each element to a specific value as null or undefined.
Example: In this example, the Empty2DArray function generates a 2D array with the specified number of rows (3) and columns (4) filled with null values. The arr1 is the resulting array.
function Empty2DArray(rows, cols) {
const array = [];
for (let i = 0; i < rows; i++) {
array[i] = [];
for (let j = 0; j < cols; j++) {
array[i][j] = null;
}
}
return array;
}
const arr1 = Empty2DArray(3, 4);
console.log(arr1);
Output
[ [ null, null, null, null ], [ null, null, null, null ], [ null, null, null, null ] ]
How to Declare Two Dimensional Empty Array in JavaScript ?
In this article, we are going to learn about Declare two-dimensional empty array by using JavaScript. A two-dimensional array is also known as a 2D array. It is a data structure in JavaScript that can hold values in rows and columns form. It is an array of arrays. Each element in a 2D array is accessible using two indices, and it is represented as an array[rowIndex][columnIndex].
There are several methods that can be used to add elements to Declare an empty two-dimensional array in JavaScript, which are listed below:
Table of Content
- Using a Loop
- Using the Array() Constructor
We will explore all the above methods along with their basic implementation with the help of examples.
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