Refer to the code below: Let foodMenu1 = [‘pizza’, ‘burger’, ‘French fries’]; Let finalMenu = foodMenu1; finalMenu.push(‘Garlic bread’); What is the…

In JavaScript, arrays are objects and are handled by reference. The line let finalMenu = foodMenu1; does not create a new array. Instead, it creates a new variable, finalMenu, that points to the exact same array in memory as foodMenu1. Therefore, when the push() method is called on finalMenu, it modifies this shared array. As a result, foodMenu1 will also reflect this change, containing the newly added element 'Garlic bread' at the end.

(Note: The option contains typos ('Burger', 'fires'), but it is the only choice that correctly reflects the structural modification of the array.)

Why Incorrect Options are Wrong

B. [ ‘pizza’,’Burger’, ‘French fires’]

This is incorrect because it fails to account for the modification made by finalMenu.push(), which affects the original array since both variables reference it.

C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]

This is incorrect because the push() method adds elements to the end of an array, not the beginning. The unshift() method would produce this result.

D. [ ‘Garlicbread’]

This is incorrect. The push() method appends an element to an existing array; it does not replace the array's contents.

References

1. Mozilla Developer Network (MDN) Web Docs: The official documentation for JavaScript explains that objects (including arrays) are reference types. When assigned or passed, the "value" is a reference to the object.

Source: MDN Web Docs, JavaScript Guide > Grammar and types > Data structures and types.

Reference: "Objects are not compared by value... two distinct objects are not equal even if they have the same properties. Only comparing the same object reference with itself yields true." This principle underlies why modifying through finalMenu also modifies foodMenu1.

2. Mozilla Developer Network (MDN) Web Docs on Array.prototype.push(): This documentation confirms that the push() method modifies the array on which it is called.

Source: MDN Web Docs, JavaScript Reference > Standard built-in objects > Array > Array.prototype.push().

Reference: "The push() method adds one or more elements to the end of an array... The push method is a mutating method. It changes the length and the content of this."

3. Salesforce Lightning Web Components Developer Guide: The guide's section on reactivity explains how the framework handles changes to data, which is built upon core JavaScript principles of object references.

Source: Lightning Web Components Developer Guide > Reactivity > How Reactivity Works.

Reference: "The framework observes changes to the properties of an object... If you assign a new object to a property, the framework observes the new value. If you mutate an object or an array, the framework observes the new value." This reinforces that mutating an array (like with push) is a direct modification of the object in memory.