JavaScript Type Operators Mockest | JavaScript

1.

What does the typeof operator return for an undefined variable?

A). undefined B). number C). boolean D). string

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2.

What will be the output of typeof null in JavaScript?

A). object B). null C). undefined D). string

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3.

How does the typeof operator handle arrays in JavaScript?

A). array B). object C). undefined D). null

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4.

What is the result of typeof NaN in JavaScript?

A). number B). NaN C). undefined D). string

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5.

What does typeof true evaluate to in JavaScript?

A). boolean B). number C). string D). undefined

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6.

How does the instanceof operator work in JavaScript?

A). Checks if an object has a specific prototype in its prototype chain. B). Checks if two variables are of the same type. C). Checks if a variable is null. D). Checks if a variable is undefined.

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7.

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

A). 1 B). 0 C). null D). undefined

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8.

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

A). 123 B). '123' C). NaN D). 1

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9.

What is the result of Boolean('false') in JavaScript?

A). 1 B). 0 C). NaN D). null

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10.

How does JavaScript evaluate Boolean(0)?

A). 1 B). 0 C). null D). undefined

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JavaScript Type Operators Mocktest

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