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Salesforce Certified JavaScript Developer Exam (JS-Dev-101) - Salesforce Exam Questions

Last updated on June 20, 2026

97% Exam Compliance
149 Total Questions
1
Question
Code:
01 const sayHello = (name) => {
02 console.log('Hello ', name);
03 };
04
05 const world = () => {
06 return 'World';
07 };
08
09 sayHello(world);
This does not print "Hello World".

What change is needed?
Options
A Change line 2 to console.log('Hello', name());
B Change line 5 to function world() {
C Change line 7 to }();
D Change line 9 to sayHello(world)();
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2
Question
for (let number = 2; number <= 5; number += 1) {
// faster code statement here
}
false?
Options
A console.classy(number + 2 === 0);
B console.error(number + 2 === 0);
C console.assert(number + 2 === 0);
D assert(number + 2 === 0);
Which statement meets the requirements to log an error when the Boolean statement evaluates to
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3
Question
Refer to the code below:
01 const myFunction = arr => {
02 return arr.reduce((result, current) => {
03 return result + current;
04 }, 10);
05 }

What is the output of this function when called with an empty array?
Options
A Returns 0
B Returns 5 ← (Text here appears to be a typo; correct value is 10, see explanation.)
C Throws an error
D Returns NaN
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4
Question
Given two expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is data type string?
Select 2
Options
A String(var1).concat(var2)
B var1.toString() + var2.toString()
C var1 + var2
D String.concat(var1 + var2)
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5
Question
Which two code snippets show working examples of a recursive function?
Select 2
Options
A const sumToTen = numVar => {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
};
B let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
return startNumber;
}
};
(Note: Option D is shown here with corrected syntax: lowercase return and matching parentheses.)
C const factorial = numVar => {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
D function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}
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