JavaScript

Practice JavaScript MCQs covering variables, data types, operators, functions, objects, arrays, DOM manipulation, events, ES6+, asynchronous programming, APIs, and modern JavaScript concepts.

105 MCQs available

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101

Which method is used to get the current time in milliseconds?

A Date.now()

B new Date().getTime()

C new Date().valueOf()

D All of the above

102

What is the output of `console.log('a' + 1)`?

A a1

B a

C 1

D NaN

103

Which method is used to check if a value is an array?

A Array.isArray()

B isArray()

C typeof

D instanceof

104

What is the output of `console.log(5 > 4 && 4 > 5)`?

A true

B false

C undefined

D NaN

105

Which keyword is used to export a module in JavaScript?

A export

B exports

C module.exports

D All of the above

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