Void operation modifies the contents of an array

My code is behaving strangely and I can't seem to figure out why. It's mysteriously changing the list without any explicit instructions to do so, and it's also affecting every duplicate item in the list instead of just one. Let me try to explain the issue as clearly as possible.

The code snippet below is meant to allow for adding, editing, and removing items from an array and updating the HTML on the page. Adding and removing items, as well as updating the HTML, are working fine, but the removal process is acting oddly.

index.js

import UnitsForm from "./lib/UnitsForm.js";

const unitsForm = new UnitsForm();
unitsForm.init();

UnitsForm.js

import AddEditUnitForm from "./AddEditUnitForm.js";

class UnitsForm {
    // Class properties and methods
}

export default UnitsForm;

AddEditUnitForm.js

class AddEditUnitForm {
    // Class properties and methods
}

export default AddEditUnitForm;

Initially, the issue seemed to be with the editUnit(values, index) function mistakenly modifying all items in the list added through the duplicateHandler(element, index) function. However, upon investigation, it was discovered that the editUnit(values, index) function was empty:

editUnit(values, index) { 
    // Function body missing or intentionally left blank
}

After contemplating various possibilities and making adjustments within the codebase, the root cause of the problem remained elusive. Despite clearing browser cache, trying different browsers, and tweaking the AddEditUnitForm.js file, the unexpected behavior persisted. Efforts to pinpoint the source of the list modification consumed hours of frustrating debugging. Any assistance or insights on resolving this perplexing issue would be greatly appreciated!

Answer №1

Update: Success! Issue resolved.

The initial issue was caused by the submitHandler() function in AddEditUnitForm.js, which was directly updating the values of the item passed through the constructor.

Another problem arose when duplicating items in an array using array.push[array[i]];. This resulted in all duplicated items being linked together, so any changes made to one affected them all.

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