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JavaScript Pertanyaan dan Jawaban Wawancara

Test your skills through the online practice test: JavaScript Quiz Online Practice Test

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Ques 1. What are JavaScript data types?

Number
String
Boolean
Function
Object
Null
Undefined.

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Ques 2. How do you convert numbers between different bases in JavaScript?

Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt ("3F", 16);

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Ques 3. What does isNaN function do?

Return true if the argument is not a number.

Example:

isNaN(123) //returns false

isNaN('Hello John') //returns true

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Ques 4. What looping structures are there in JavaScript?

Looping structures are:

for
while
do-while
foreach

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Ques 5. What boolean operators does JavaScript support?

Boolean operators in JavaScript are:

&&
||
!

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