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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Browser and Events	17%	- DOM selection and manipulation - Browser APIs and developer tools - Event handling, propagation, listeners
Topic 2: Server Side JavaScript	8%	- Node.js fundamentals and core modules - Package management and CLI tools
Topic 3: Variables, Types, and Collections	23%	- JSON parsing and manipulation - Data types, type coercion, truthy/falsy values - Strings, numbers, dates, arrays and methods - Variable declaration and scope
Topic 4: Debugging and Error Handling	7%	- Error types and handling strategies - Console usage, breakpoints and debugging techniques
Topic 5: Objects, Functions, and Classes	25%	- Function types, scope, closures, arrow functions - Object creation, properties, prototypes - ES6 classes, inheritance, modules, decorators
Topic 6: Testing	7%	- Unit test structure and effectiveness - Test coverage and improvement
Topic 7: Asynchronous Programming	13%	- Event loop and execution flow - Callbacks, promises, async/await

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q13-Q18):

NEW QUESTION # 13
Universal Container(UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that cause this problem.To verify this, the developer decides to do everything and log the time each of these three suspicious functions consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console.timeLog()
B. console.getTime()
C. console.timeStamp()
D. console.trace()

Answer: A

NEW QUESTION # 14
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?

A. true
false
B. 5
0
C. 5
undefined
D. 5
-1

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
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 # 15
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1,2]?
Choose 3 answer

A. let x = arr. slice (0, 2);
B. let x = arr. slice (2);
C. let x =arr.splice(0, 2);
D. let x arr.filter((a) => (return a <= 2 });
E. let x = arr.filter ((a) => 2 }) ;

Answer: A,C,D

NEW QUESTION # 16
What is the result of the code block?

A. The console logs only 'flag'.
B. The console logs 'flag' and another flag.
C. The console logs 'flag' and then an error is thrown.
D. An error is thrown.

Answer: A

NEW QUESTION # 17
Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A. document. getElementByid('row-uc').addClass('priority-account*);
B. document. queryselector('#row-uc').ClassList.add('priority-account');
C. document. querySelectorAll('#row-uc') -classList.add("priority-accour');
D. document. querySelector (#row-uc').classes-push('priority-account');

Answer: B

NEW QUESTION # 18
......

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