Troubleshooting a Multi-dimensional Array Reference Issue

Question

Troubleshooting a Multi-dimensional Array Reference Issue

Currently, I am working with an Array and need to modify the last item by pushing it back. Below is a simplified version of the code:

var array = [
                 [ [0,1,2], [3,4,5] ]
            ];

//other stuff...

var add = array[0].slice(); //creating a clone of the array (not functioning as expected)
add[0][0] = 10;
array.push(add);

console.log(array);

Here is the resulting output:

Upon inspection, both the first and second items in the array have their first element changed to 10. How do I go about resolving this issue? The array has already been cloned.

javascript arrays reference

Answer 1

Answer №1

Array.prototype.slice() creates a shallow copy, meaning nested arrays are not duplicated. To achieve a deep cloning effect, it is recommended to use a method like the one described here.

Answer 2

Array.prototype.slice() creates a shallow copy, meaning nested arrays are not duplicated. To achieve a deep cloning effect, it is recommended to use a method like the one described here.

Answer 3

Answer №2

When using Array.prototype.slice(), be aware that it does not actually clone nested arrays. To address this issue, you can employ a technique like the one demonstrated below:

var array = [
                 [ [0,1,2], [3,4,5] ]
            ];

//additional code...

var copy = array[0].slice(); //create a shallow copy of the array (note: this may not fully clone nested arrays)
copy[0] = array[0][0].slice();
copy[0][0] = 10;
array.push(copy);

console.log(array);

Answer 4

When using Array.prototype.slice(), be aware that it does not actually clone nested arrays. To address this issue, you can employ a technique like the one demonstrated below:

var array = [
                 [ [0,1,2], [3,4,5] ]
            ];

//additional code...

var copy = array[0].slice(); //create a shallow copy of the array (note: this may not fully clone nested arrays)
copy[0] = array[0][0].slice();
copy[0][0] = 10;
array.push(copy);

console.log(array);

Troubleshooting a Multi-dimensional Array Reference Issue

Answer №1

Answer №2

Similar questions

Transmitting data from the backend to AngularJS during page load

Navigating through the URL using an AJAX request with jQuery

Update the array in state by adding a new element using setState

Identify modifications to properties in Angular

Issue with facebook button in reactJS where onClick() event is not being triggered

Tips for retrieving keycodes/key/which values for DOMSubtreeModified Event

A singular Vuejs Pinia store utilizing namespaced actions

Sort slider items using Show/Hide feature in bxSlider

Unable to utilize Socket.io version 2.0.3

Unable to load the manually added module in the /node_modules/ folder

Error: A TypeError occurred with the startup because it was unable to read the property 'Collection' as it was

Quicker way to apply appendChild

Methods for extracting the date value from a Material UI datepicker?

Integrate PHP include files into a website without allowing direct access, then dynamically load them using jQuery AJAX

Leveraging the 'window' object as a dependency in the useEffect hook within NextJS

Save array data to a file in Node.js once it finishes looping

Tips for guaranteeing that the value is retained in an array when setting a Cookie in AEM/cq5

I'm currently facing difficulties trying to implement AJAX with JavaScript and PHP as the desired output is not being

Tips for adding color to the <td> element in an ejs file using nodeJS

As the second line of Javascript code is being executed, the first line is still