Modern JavaScript from the Beginning - Second Edition - Prototypes and the Prototype Chain
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Information Technology (IT), Architecture
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University
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Practice Problem
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a prototype in JavaScript?
A function that creates new objects.
A method to convert objects to strings.
A special object that allows methods and properties to be shared across instances.
A variable that holds data.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does JavaScript find a method like 'toString' when called on an object?
It uses a built-in dictionary.
It searches the entire codebase.
It checks the object's prototype chain.
It looks in the global scope first.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which prototype does the array prototype inherit from?
Number prototype
Object prototype
Function prototype
String prototype
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the 'getPrototypeOf' method?
To modify the prototype chain.
To retrieve the prototype of an object.
To delete an existing prototype.
To create a new prototype.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might you add a method to a prototype instead of directly to an object?
To prevent the method from being used.
To allow the method to be shared across all instances.
To increase the object's size.
To make the method private.
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