Test Salesforce JS-Dev-101 Pattern - New JS-Dev-101 Braindumps Questions

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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 2
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 3
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 4
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 5
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.
Topic 6
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q77-Q82):

NEW QUESTION # 77
Refer to the code snippet:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after the code executes?

Answer: B

Explanation:
Comprehensive and Detailed
The loop removes every 4:
Start: [1, 2, 3, 4, 4, 5, 4, 4]
i=0 → 1 (no change)
i=1 → 2 (no change)
i=2 → 3 (no change)
i=3 → 4 → splice removes index 3 → [1,2,3,4,5,4,4], then i-- → 2
Next loop, i=3 → 4 again → splice → [1,2,3,5,4,4], i-- → 2
i=3 → 5 (no change)
i=4 → 4 → splice → [1,2,3,5,4], i-- → 3
i=4 → 4 → splice → [1,2,3,5], i-- → 3
Next i=4, array.length is 4 → loop ends.
All 4s removed, final array: [1, 2, 3, 5].


NEW QUESTION # 78
A developer initiates a server with the file server,js and adds dependencies in the source codes package,json that are required to run the server.
Which command should the developer run to start the server locally?

Answer: C


NEW QUESTION # 79
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?

Answer: D


NEW QUESTION # 80
Refer to the code below:
01 let car1 = new promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, "Car 2
completed"));
04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, "Car 3
Completed"));
05 Promise.race([car1, car2, car3])
06 .then(value => (
07 let result = $(value) the race. `;
08 ))
09 .catch( arr => (
10 console.log("Race is cancelled.", err);
11 ));
What is the value of result when Promise.race executes?

Answer: C


NEW QUESTION # 81
Refer to the code below:
const searchText = 'Yay! Salesforce is amazing!';
let result1 = searchText.search(/sales/i);
let result2 = searchText.search(/sales/);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

Answer: B

Explanation:
String: "Yay! Salesforce is amazing!"
Index positions:
'Y' at 0, 'a' at 1, 'y' at 2, '!' at 3, space at 4, 'S' at 5, 'a' at 6, 'l' at 7, 'e' at 8, 's' at 9, etc.
Substring "Sales" starts at index 5.
String.prototype.search with a regex returns the index of the first match or -1 if there is no match.
searchText.search(/sales/i);
/sales/i is case-insensitive because of the i flag.
It matches "Sales" beginning at index 5.
So result1 is 5.
searchText.search(/sales/);
/sales/ is case-sensitive.
It requires lowercase "sales".
The text has "Sales" with uppercase S, so this does not match.
search returns -1 when there is no match.
So result2 is -1.
Console output:
First log: 5
Second log: -1
Option D matches this.
Concepts: regex search, case sensitivity vs i flag, String.prototype.search return values.


NEW QUESTION # 82
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