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Salesforce Certified JavaScript Developer I exam is a highly recognized certification that demonstrates a developer's ability to design, develop, and maintain custom applications using JavaScript in the Salesforce platform. Salesforce Certified JavaScript Developer (JS-Dev-101) certification exam is created to test the knowledge and skills of developers in areas like Apex, Visualforce, and Lightning components.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q42-Q47):

NEW QUESTION # 42
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 fizzbuss function?

A. Let res = fizzbuss (3) ;
Console.assert (res === 'buzz' ) ;
B. Let res = fizzbuss (15) ;
Console. assert (res === 'fizzbuzz' ) ;
C. Let res = fizzbuss (Infinity);
Console.assert (res === '' ) ;
D. Let res = fizzbuss (5) ;
Console. assert (res === '' ) ;

Answer: B,C

NEW QUESTION # 43
Refer to the code:

Given the code above, which three properties are set for pet1? Choose 3 answers

A. canTalk
B. size
C. type
D. name
E. owner

Answer: A,B,C

NEW QUESTION # 44
Refer to the following code:

What is the output of line 11?

A. [1,2]
B. ["bar", "foo"]
C. ["foo:1", "bar:2"]
D. ["foo", "bar"]

Answer: D

NEW QUESTION # 45
Function to test:
01 const sum3 = (arr) = > {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1] ;
05 return arr[0] + arr[1] + arr[2];
06 };
Which two assert statements are valid tests for this function?

A. console.assert(sum3([-3, 2]) === -1);
B. console.assert(sum3([ ' hello ' , 2, 3, 4]) === NaN);
C. console.assert(sum3([0]) === 0);
D. console.assert(sum3([1, ' 2 ' ]) == 12);

Answer: A,C

Explanation:
Evaluate each test:
A). sum3([1, ' 2 ' ])
* Array length is 2 # line 4: arr[0] + arr[1] # 1 + ' 2 ' # ' 12 ' (string).
* Assertion: ' 12 ' == 12 is true (type coercion). However, this "test" is not logically correct: a numeric sum function should not be expected to return ' 12 ' as a string. It passes only because of weak equality coercion, so it is not a good/valid test of correct behavior.
B). sum3([ ' hello ' , 2, 3, 4])
* Length # 3 # line 5: ' hello ' + 2 + 3 # ' hello2 ' + 3 # ' hello23 ' .
* ' hello23 ' === NaN is always false because NaN is never equal to anything, not even itself. This assertion fails and also misunderstands how NaN comparisons work.
C). sum3([-3, 2])
* Length 2 # -3 + 2 = -1.
* Assertion: -1 === -1 # true. This is a correct and meaningful test.
D). sum3([0])
* Length 1 # returns arr[0] # 0.
* Assertion: 0 === 0 # true. Also a correct and meaningful test.
Therefore, the valid and logically correct tests here are C and D.

NEW QUESTION # 46
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion passes.
B. The line 02 assertion fails.
C. The line 05 assertion fails.
D. The line 02 assertion passes.

Answer: C,D

NEW QUESTION # 47
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