Q
What does Number('123') return in JavaScript?

Answer & Solution

Answer: Option A
Solution:
Number('123') converts the string '123' to a number 123.
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What is the result of typeof undefined in JavaScript?

A). undefined

B). string

C). null

D). object

What will be the output of typeof {} in JavaScript?

A). object

B). array

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A). 1

B). 0

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How does the instanceof operator work in JavaScript?

A). Checks if an object has a specific prototype in its prototype chain.

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A). number

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D). string

What will be the output of [] instanceof Array in JavaScript?

A). 1

B). 0

C). null

D). undefined

How does the instanceof operator behave with primitive values in JavaScript?

A). Throws an error

B). Returns true for all primitive values

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What does the typeof operator return for an undefined variable?

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D). string

How does JavaScript evaluate typeof /^regex$/ in JavaScript?

A). regexp

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A). object

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D). string