10 Questions
What method in JavaScript rounds a number to a given precision?
toFixed(n)
Which constructor in JavaScript is considered highly unrecommended for creating wrapper objects?
new Number()
What is the output from the alert( typeof new Number(0) ) statement in JavaScript?
"object"
Why does the alert( 'zero is truthy!?!' ) statement get executed in the given code snippet?
Because zero is treated as truthy since it's an object
Which function in JavaScript converts a string into a number?
Number()
What is a key distinction between primitives and objects in JavaScript?
Primitives are lightweight while objects are heavier and require additional resources.
Which of the following is NOT a primitive type with its corresponding object wrapper?
BigInt - BigNum
What is a benefit of using objects in JavaScript?
Objects provide a way to store functions as properties.
Why does the creator of JavaScript use 'object wrappers' for primitives like String, Number, Boolean, Symbol, and BigInt?
To provide different sets of methods for each primitive type.
How does the JavaScript engine handle primitives when providing methods like str.toUpperCase()?
Optimizes the process by possibly skipping the creation of an extra object.
Test your knowledge on the distinctions between primitives and objects in JavaScript, and learn about storing functions as properties in objects. This quiz will help you understand the differences between primitives and objects in JavaScript.
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