Free Certified JavaScript Developer I Exam Braindumps
Salesforce Certified JavaScript Developer I Questions 91–95 (page: 20)

Updated On: 10-Feb-2026

The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ? Choose 2 answers:

  1. console.assert( arr.length === 5 );
  2. arr.forEach(elem => console.assert(elem === 0)) ;
  3. console.assert(arr[0] === 0 && arr[ arr.length] === 0);
  4. console.assert (arr.length >0);

Answer(s): A,B



A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = `July';

const year = 2019;
if(year === 2019) {
monthName =`June';
}
Which line edit should be made to make this code run?

  1. 01 let monthName ='July';
  2. 02 let year =2019;
  3. 02 const year = 2020;
  4. 03 if (year == 2019) {

Answer(s): A



Refer to the following code:
<html lang="en">
<body>
<divonclick = "console.log(`Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log(`Inner message.');
}
const elem = document.getElementById(`myButton');
elem.addEventListener(`click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?

  1. Outer message
  2. Outer messageInner message
  3. Inner messageOuter message
  4. Inner message

Answer(s): D



Refer to the codebelow:
function foo () {

const a =2;
function bat() {
console.log(a);
}
return bar;
}
Why does the function bar have access to variable a ?

  1. Inner function's scope
  2. Hoisting
  3. Outer function's scope
  4. Prototype chain

Answer(s): C



Given the following code:
document.body.addEventListener(` click ', (event) => { if (/* CODE REPLACEMENT HERE */) {
console.log(`button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

  1. Event.clicked
  2. e.nodeTarget ==this
  3. event.target.nodeName == `BUTTON'
  4. button.addEventListener(`click')

Answer(s): C



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