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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Debugging and Error Handling	7%	- Debugging tools and breakpoints - Console methods and logging - Defensive programming practices - Error types and exception handling
Variables, Types, and Collections	23%	- Truthy and falsy values - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules - Variable declaration and initialization - Working with strings, numbers, dates, and booleans
Browsers and Events	17%	- Script loading and execution order - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties
Server-Side JavaScript	8%	- Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import - Core Node.js modules
Asynchronous Programming	13%	- Fetch API and HTTP requests - Event loop and micro/macro tasks - Async/await syntax - Callbacks and callback hell - Promises and chaining
Objects, Functions, and Classes	25%	- Object creation, properties, and methods - Function definitions, parameters, and scope - Closures and execution context - Modules and imports/exports - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns
Testing	7%	- Code coverage and best practices - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q41-Q46):

NEW QUESTION # 41
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

A. 1.1.4
B. 2.0.0
C. 1.2.3
D. 1.2.0

Answer: B

NEW QUESTION # 42
Refer to the code below:

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

Answer:

Explanation:
event.target.id =='myElement'

NEW QUESTION # 43
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers

A. Let arr2 = Array. From (arr1) ;
B. Let arr2 = arr1 .slice (0, 5);
C. Let arr2 = arr1;
D. Let arr2 = arr1 sort ();

Answer: C,D

NEW QUESTION # 44
Refer to the code below:

What is the value result after line 10 executes?

A. Undefined Developer
B. Error: myfather.job is not a function
C. John Developer
D. John undefined

Answer: B

NEW QUESTION # 45
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string index values, the value of str is 'javascript'. What is the reason for this value:

A. Non-primitive values are immutable.
B. Non-primitive values are mutable.
C. Primitive values are immutable.
D. Primitive values are mutable.

Answer: C

NEW QUESTION # 46
......

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