The Modern JavaScript Bootcamp (2019) - Object References

The video tutorial explores the concept of passing objects in JavaScript functions, using an expense manager application as an example. It explains how objects are referenced in memory, demonstrating that changes to an object within a function affect the original object due to shared memory references. The tutorial also covers creating and manipulating objects, specifically focusing on an 'add expense' function. It concludes with experiments on object assignments, illustrating how assigning new values breaks the reference binding.

What happens when an object is passed as an argument to a function?

• A new object is created with the same properties.

• The original object is cloned.

• The object is converted to a string.

• A reference to the original object is passed.

In the expense manager application, what is the initial value of the 'expenses' property?

• 50

• 100

• 0

• Undefined

What is the purpose of the 'add expense' function in the expense manager?

• To create a new account

• To reset the expenses to zero

• To add a specified amount to the expenses

• To delete an account

What happens when you assign a new value to an object reference inside a function?

• Both the original and new objects are modified.

• The reference is broken and points to a new object.

• The function throws an error.

• The original object is modified.

If 'otherAccount' is set equal to 'myAccount', what happens when you change a property of 'otherAccount'?

• Neither is updated.

• Only 'otherAccount' is updated.

• Only 'myAccount' is updated.

• Both 'myAccount' and 'otherAccount' are updated.

What is the result of assigning a new object to 'otherAccount' after it was set equal to 'myAccount'?

• An error is thrown.

• 'myAccount' remains unchanged.

• Both 'myAccount' and 'otherAccount' point to the new object.

• Both objects are deleted.

What is the main takeaway regarding object references in JavaScript?

• Object references can be broken by assignment.

• Objects are always cloned when passed to functions.

• Objects cannot be modified once created.

• Functions cannot accept objects as arguments.