Q
How does the instanceof operator work in JavaScript?

Answer & Solution

Answer: Option A
Solution:
The instanceof operator checks if an object has a specific prototype in its prototype chain.
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What does typeof true evaluate to in JavaScript?

A). boolean

B). number

C). string

D). undefined

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

A). regexp

B). object

C). string

D). null

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

A). object

B). array

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What does typeof window.evaluate evaluate to in JavaScript?

A). function

B). object

C). string

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What is the output of typeof function(){} in JavaScript?

A). function

B). object

C). undefined

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

A). 123

B). '123'

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What will be the output of typeof null in JavaScript?

A). object

B). null

C). undefined

D). string

How does JavaScript evaluate Boolean(0)?

A). 1

B). 0

C). null

D). undefined

What does typeof new Date() evaluate to in JavaScript?

A). date

B). object

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How does the typeof operator handle arrays in JavaScript?

A). array

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C). undefined

D). null