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JavaScript-Developer-I Practice Questions

Question # 1

developer publishes a new version of a package with new features that do not break
backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number
be?

A.

2.0.0

B.

1.2.3

C.

1.1.4

D.

1.2.0



D.

1.2.0



Question # 2

Given the requirement to refactor the code above to JavaScript class format, which class
definition is correct?

A. Option A
B. Option B
C. Option C
D. Option D


A. Option A


Question # 3

Which statement phrases successfully?

A.

JSON.parse ( ‘ foo ’ );

B.

JSON.parse ( “ foo ” );

C.

JSON.parse( “ ‘ foo ’ ” );

D.

JSON.parse(‘ “ foo ” ’);



D.

JSON.parse(‘ “ foo ” ’);



Question # 4

A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.

What is the value of msg when getAvailableabilityMessage (“newUserName”) is executed and get Availability (“newUserName”) returns true?


A.

"msg is not defined"

B.

"newUserName"

C.

"User-name available"

D.

undefined



C.

"User-name available"



Question # 5

A developer wants to leverage a module to print a price in pretty format, and has imported
a method as shown below:
Import printPrice from ‘/path/PricePrettyPrint.js’;
Based on the code, what must be true about the printPrice function of the PricePrettyPrint
module for this import to work ?

A.

printPrice must be be a named export

B.

printPrice must be an all export

C.

printPrice must be the default export

D.

printPrice must be a multi exportc



C.

printPrice must be the default export



Question # 6

Given the expressions var1 and var2, what are two valid ways to return the concatenation
of the two expressions and ensure it is string? Choose 2 answers

A.

var1 + var2

B.

var1.toString ( ) var2.toString ( )

C.

String (var1) .concat (var2)

D.

string.concat (var1 +var2)



B.

var1.toString ( ) var2.toString ( )


D.

string.concat (var1 +var2)



Question # 7

A developer wrote a fizzbuzz function that when passed in a number, returns the
following:
‘Fizz’ if the number is divisible by 3.
‘Buzz’ if the number is divisible by 5.
‘Fizzbuzz’ if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 or 5.
Which two test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers

A.

let res = fizzbuzz(5);
console.assert ( res === ‘ ’ );

B.

let res = fizzbuzz(15);
console.assert ( res === ‘ fizzbuzz ’ )

C.

let res = fizzbuzz(Infinity);
console.assert ( res === ‘ ’ )

D.

let res = fizzbuzz(3);
console.assert ( res === ‘ buzz ’ )



B.

let res = fizzbuzz(15);
console.assert ( res === ‘ fizzbuzz ’ )


C.

let res = fizzbuzz(Infinity);
console.assert ( res === ‘ ’ )


D.

let res = fizzbuzz(3);
console.assert ( res === ‘ buzz ’ )



Question # 8

Consider type coercion, what does the following expression evaluate to?
True + 3 + ‘100’ + null

A.

104

B.

4100

C.

‘3100null’

D.

‘4100null’



D.

‘4100null’



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Salesforce JavaScript-Developer-I Exam Dumps

Exam Name: Salesforce Certified JavaScript Developer I (SU24)
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  • Total Questions: 215
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