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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Server-Side JavaScript8%- Module system and require/import
- Command-line tools and scripts
- Core Node.js modules
- Node.js fundamentals and runtime
Topic 2: Debugging and Error Handling7%- Console methods and logging
- Error types and exception handling
- Debugging tools and breakpoints
- Defensive programming practices
Topic 3: Testing7%- Test doubles and mocks
- Code coverage and best practices
- Unit testing concepts
- Testing frameworks and assertions
Topic 4: Objects, Functions, and Classes25%- Function definitions, parameters, and scope
- Decorators and advanced function patterns
- Class syntax, inheritance, and prototypes
- Closures and execution context
- Object creation, properties, and methods
- Modules and imports/exports
Topic 5: Browsers and Events17%- Document Object Model (DOM) manipulation
- Event handling, propagation, and delegation
- Browser APIs and Web Storage
- Script loading and execution order
- Window and document object properties
Topic 6: Asynchronous Programming13%- Fetch API and HTTP requests
- Callbacks and callback hell
- Event loop and micro/macro tasks
- Promises and chaining
- Async/await syntax
Topic 7: Variables, Types, and Collections23%- Type coercion and conversion rules
- JSON parsing and usage
- Variable declaration and initialization
- Working with strings, numbers, dates, and booleans
- Truthy and falsy values
- Array methods and data manipulation

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q139-Q144):

NEW QUESTION # 139
Considering type coercion, What does the following expression evaluate to?
True + ) + '100 ' + null

Answer: B


NEW QUESTION # 140
Refer to the following code block:

What is the console output?

Answer: B


NEW QUESTION # 141
A developer copied a JavaScript object:
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > `${this.firstName},${this.lastName}`;
05 }
06
07 const john = new Person();
08 const dan = Object.assign({}, john);
09 dan.firstName = ' Dan ' ;
How does the developer access dan ' s firstName, lastName?

Answer: A

Explanation:
* Person instances have:
* firstName and lastName as string properties.
* A name method that returns a combined string: `${this.firstName},${this.lastName}`.
* Object.assign({}, john) creates a shallow copy of john into a new object, dan.
After:
dan.firstName = ' Dan ' ;
* dan.name() returns " Dan,Doe " .
Analysis of options:
* A: dan.firstName() and dan.lastName() are function calls , but firstName/lastName are strings, not functions # TypeError.
* B: Calls the defined method and uses both names correctly.
* C: dan.name is a function reference; you'd still need to call it: dan.name().
* D: dan.firstName + dan.lastName is " DanDoe " , no separator. It accesses the properties but not in the method the developer defined.
The intended way, using the provided API, is dan.name().


NEW QUESTION # 142
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:

A different developer made changes to the behavior of sum3 to instead sum all of the number present In the array.
Which two results occur when running the test on the updated sum3 function?
Choose 2 answers

Answer: A,D


NEW QUESTION # 143
Why would a developer specify a package.jason as a developed forge instead of a dependency ?

Answer: C


NEW QUESTION # 144
......

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