JavaScript Identifiers Mockest | JavaScript

1.

What is a valid identifier in JavaScript?

A). 123abc B). abc123 C). let D). var

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2.

Which of the following is an invalid identifier?

A). _variable B). var$ C). 2variable D). variable2

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3.

Which characters are allowed in JavaScript identifiers?

A). Letters only B). Letters and numbers only C). Letters, numbers, $ and _ D). Any special characters

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4.

Can JavaScript identifiers include spaces?

A). Yes B). No C). Only in ES6 D). Only in strings

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5.

What will be the result of using a reserved word as an identifier?

A). No error B). Syntax error C). Logical error D). Runtime error

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6.

Which of the following is a reserved word in JavaScript?

A). myVariable B). function C). let D). number

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7.

What is the maximum length of an identifier?

A). 255 characters B). 31 characters C). 64 characters D). No limit

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8.

Can identifiers start with a digit in JavaScript?

A). Yes B). No C). Only in ES5 D). Only in strict mode

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9.

Which identifier is valid in strict mode?

A). public B). _public C). 123public D). public$

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10.

Which is a correct identifier for a variable?

A). 9variable B). variable-9 C). variable_9 D). variable 9

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JavaScript Identifiers Mocktest

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