Looping through a matrix with JavaScript

by Janeth Kent Date: 03-05-2021 javascript coding functions


We were already talking about how to multiply arrays in JavaScript and we realised that we had not explained something as simple as traversing an array with Javascript. So we couldn't let the time pass and we have started working to explain you how to do this task.

The first thing to do is to define the array in Javascript. To do this we instantiate it directly on a constant.

const matrix = [[1,2,3],[4,5,6],[7,8,9]];

Here we see that the elements of the array are themselves arrays of elements, which ends up forming the matrix.

Being an array of arrays, we will need two for loops to traverse the matrix. The first one will traverse the main array and the second one will traverse each of the secondary arrays. The arrays will go from the initial position to the length of the array, which we get through the .length property.

In this way the two concatenated loops are as follows:

for (x=0;x<matrix.length;x++) {      
     for (y=0;y<matrix[x].length;y++) {        
       // Acceder al elemento      
     }  
}

Inside the second loop, we can access the element via the x and y variables of the matrix.

for (x=0;x<matrix.length;x++) {      
     for (y=0;y<matrix[x].length;y++) {          
          console.log(matrix[x][y]);      
     }  
}

This code returns the list of the elements we have traversed in the matrix. So, in order not to leave it without formatting, we are going to add a little bit of formatting in the generation of the array information. The final code will look like this:

for (x=0;x<matrix.length;x++) {      
     text = ""      
     for (y=0;y<matrix[x].length;y++) {          
          text += matrix[x][y] + "t";      
      }      
      console.log(text)  
}

I hope you found useful this simple code that explains how to traverse a matrix with JavaScript.

 
by Janeth Kent Date: 03-05-2021 javascript coding functions hits : 5001  
 
Janeth Kent

Janeth Kent

Licenciada en Bellas Artes y programadora por pasión. Cuando tengo un rato retoco fotos, edito vídeos y diseño cosas. El resto del tiempo escribo en MA-NO WEB DESIGN END DEVELOPMENT.

 
 
 

Related Posts

Difference between arrow and normal functions in JavaScript

In this tutorial we are going to see how arrow functions differ from normal JavaScript functions. We will also see when you should use one and when you should use…

JavaScript Arrow functions: What they are and how to use them

In this article we are going to see what they are and how to use JavaScript Arrow Functions, a new feature introduced with the ES6 standard (ECMAScript 6). What are Arrow…

How to insert an element into an array with JavaScript

In this brief tutorial you will learn how to insert one or more elements into an array with JavaScript. For this we will use the splice function. The splice function will not…

What is the difference between primitives types and objects in JavaScript?

In this short tutorial we are going to look at the differences between primitive types and objects in JavaScript. To start with, we're going to look at what primitive types…

How to get DOM elements with JavaScript

When you access any element of the DOM, it is usual to save it in a variable. This is something that at first might seem very simple, but if you…

How to reverse an array in JavaScript

In this tutorial we are going to see how you can change the order of the elements of an array so that they are inverted. You could use a loop…

How synchronize the scroll of two divs with JavaScript

In case you have two divs of different sizes you may sometimes want to scroll both at the same time but at different speeds depending on their size. For example,…

How to use the codePointAt method in JavaScript

The JavaScript codePointAt method has more or less the same function as the charCodeAt method, used to get the 16-bit Unicode representation of the character at a certain position in…

How to check if a value is a number in JavaScript

In this short tutorial we are going to look at the various methods that exist to find out if a value is a number in JavaScript.   1. Using the isNaN() function   One…

How to use the charCodeAt method in JavaScript

The charCodeAt method is accepted by strings in JavaScript, returning the 16-bit Unicode code of the character at the position we pass as a parameter to the method. The charCodeAt method…

How to use the charAt method in JavaScript

The charAt method is accepted by strings in JavaScript, returning the position of the character passed as a parameter within the string. If the string contains multiple occurrences of the character…

Strings in JavaScript: What they are and how to use them

In this tutorial we are going to explain what strings are and how they are used in JavaScript. The tutorial is intended for people who are learning to program in…

We use our own and third-party cookies to improve our services, compile statistical information and analyze your browsing habits. This allows us to personalize the content we offer and to show you advertisements related to your preferences. By clicking "Accept all" you agree to the storage of cookies on your device to improve website navigation, analyse traffic and assist our marketing activities. You can also select "System Cookies Only" to accept only the cookies required for the website to function, or you can select the cookies you wish to activate by clicking on "settings".

Accept All Only sistem cookies Configuration