
JavaScript
Quiz
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Other
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University
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Practice Problem
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Medium
Son Nguyen
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is not a primitive data type in JavaScript?
number
string
boolean
array
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which operator is used to compare two values and return true if they are not equal in value and data type?
!=
==
!==
===
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the expression true && false in JavaScript?
true
false
undefined
null
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the output of the following code? console.log(2 + "2");
"4"
4
"22"
22
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which keyword is used to declare a variable that cannot be reassigned in JavaScript?
const
let
var
none of all the answers
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the expression "5" - 2 in JavaScript?
3
"3"
NaN
undefined
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method is used to remove the last element from an array in JavaScript?
pop()
push()
shift()
unshift()
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