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Salesforce JS-Dev-101 Exam Syllabus Topics:
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
- A. Add a listener to the window object to handle the load event
- B. Add a listener to the window object to handle the DOMContentLoaded event
- C. Add a handler to the personalizeWebsiteContent script to handle the load event
- D. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
Correct Answer: A 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
A developer removes the HTML class attribute from the checkout button, so now it is simply:
<button>Checkout</button>
There is a test to verify the existence of the checkout button, however it looks for a button with class="blue". The test fails because no such button is found.
Which type of test category describes this test?
- A. True positive
- B. False negative
- C. True negative
- D. False positive
Correct Answer: D 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Refer to the code below:
01 let first = 'Who';
02 let second = 'What';
03 try {
04 try {
05 throw new Error('Sad trombone');
06 } catch (err) {
07 first = 'Why';
08 throw err;
09 } finally {
10 second = 'When';
11 }
12 } catch (err) {
13 second = 'Where';
14 }
What are the values for first and second once the code executes?
- A. first is Why and second is When.
- B. first is Who and second is When.
- C. first is Who and second is Where.
- D. first is Why and second is Where.
Correct Answer: D 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Refer to the code below:
<html>
<body>
<div id="logo">Hello Logo!</div>
<button id="test">Click me</button>
</body>
<script>
function printMessage(event) {
console.log('This is a test message');
}
let el = document.getElementById('test');
el.addEventListener("click", printMessage, false);
</script>
</html>
Which action should be done?
- A. Add event.stopPropagation(); to window.onload event handler
- B. Add event.removeEventListener(); to window.onload event handler
- C. Add event.stopPropagation(); to printMessage function
- D. Add event.removeEventListener(); to printMessage function
Correct Answer: C 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Refer to the code:
const pi = 3.1415926;
What is the data type of pi?
- A. Decimal
- B. Double
- C. Number
- D. Float
Correct Answer: C 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
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