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JavaScript Primitives vs. Objects

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Questions and Answers

What method in JavaScript rounds a number to a given precision?

toFixed(n) (correct)

roundPrecision(n)

precisionRound(n)

numberRound(n)

Which constructor in JavaScript is considered highly unrecommended for creating wrapper objects?

new String()

new Boolean()

new Object()

new Number() (correct)

What is the output from the alert( typeof new Number(0) ) statement in JavaScript?

"string"

"boolean"

"number"

"object" (correct)

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 Signup and view all the answers

Which function in JavaScript converts a string into a number?

Number() Signup and view all the answers

What is a key distinction between primitives and objects in JavaScript?

Primitives are lightweight while objects are heavier and require additional resources. Signup and view all the answers

Which of the following is NOT a primitive type with its corresponding object wrapper?

BigInt - BigNum Signup and view all the answers

What is a benefit of using objects in JavaScript?

Objects provide a way to store functions as properties. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers