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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:
Refer to the code below:
01 const objBook = {
02 title: 'JavaScript',
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = 'Robert';
What are the values of objBook and newObjBook respectively?
- A. { author: "Robert", title: "JavaScript" }
{ author: "Robert", title: "JavaScript" } - B. { title: "JavaScript" }
{ title: "JavaScript" } - C. { author: "Robert", title: "JavaScript" }
undefined - D. { author: "Robert" }
{ author: "Robert", title: "JavaScript" }
Correct Answer: B 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?
- A. let numberValue = Number(strNumber);
- B. let numberValue = Integer(strNumber);
- C. let numberValue = textValue.toInteger();
- D. let numberValue = (number) textValue;
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the code below:
01 let country = {
02 get capital() {
03 let city = Number("London");
04
05 return {
06 cityString: city.toString(),
07 }
08 }
09 }
Which value can a developer expect when referencing country.capital.cityString?
- A. An error
- B. 'London'
- C. NaN
- D. undefined
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
- A. Replace line 03 with const input = document.getElementByIdName('input');
- B. Replace line 02 with button.addEventListener("onclick", function() {
- C. Replace line 04 with console.log(input.value);
- D. Replace line 02 with button.addCallback("click", function() {
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the code below:
01 async function functionUnderTest(isOK) {
02 if (isOK) return 'OK';
03 throw new Error('not OK');
04 }
Which assertion accurately tests the above code?
- A. console.assert(await functionUnderTest(true), 'not OK')
- B. console.assert(functionUnderTest(true), 'OK')
- C. console.assert(await functionUnderTest(true), 'OK')
- D. console.assert(await (functionUnderTest(true), 'not OK'))
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
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This means that if due to any reason you are not able to pass the JS-Dev-101 actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.
