JavaScript-Developer-I Study Guide Pdf - JavaScript-Developer-I Test Papers

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q113-Q118):

NEW QUESTION # 113
What are two unique features of fat-arrow functions compared to normal function definitions?

A. The function uses the this from the enclosing scope.
B. The function generates its own this making it useful for separating scope.
C. The function receives an argument called parentThis, giving the enclosing lexical scope.
D. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

Answer: A,D

Explanation:
Arrow functions have two defining characteristics:
* Implicit return when written as a single expression:
* const fn = () = > 5; // returns 5 automatically
This is unique to arrow functions # A is correct.
* Lexical this binding : Arrow functions do not create their own this. Instead, they use the this value from the surrounding scope # B is correct.
Incorrect options:
* C is false: There is no special argument called parentThis.
* D is the opposite of arrow function behavior: Normal functions create their own this; arrow functions do not.
JavaScript Knowledge References (text-only)
* Arrow functions have lexical this binding.
* Arrow functions support implicit return for single expressions.

NEW QUESTION # 114
Given the HTML below:

Which statement adds the priority-account css class to the Applied Shipping row?

A. document.querySelector('#row-as').classList.add('priority-account');

Answer: A

NEW QUESTION # 115
A developer wants to literate through an array of objects and count the objects whose property value, name, start with the letter N. const arrobj - [{''name ''t ''Zach''}, { ''name t Kate'') , ( ''name Alice'') < ( ''name'' t ''Bob'') , (''name'' t ''Nathan) , (''name'' t ''Nathandle1'')] Refer to the code snippet below:

Which missing lines 02 and 03 return the correct count?

A. Conset sun + curr. StartsWith ('N') 7 1 : 1;
Return acc + sum ;
B. Const sum = curr. name startsWith ('N') 7 1 : 0;
Return curr + sum;
C. Comst sum = curr. name startsWith ('N') 7 1 : 0;
Return curr + sum;
D. Comst sum = curr. Name startsWith ('N') 7 1 : 0
Return acc + sum;

Answer: D

NEW QUESTION # 116
Refer to code below:
Const objBook = {
Title: 'Javascript',
};
Object.preventExtensions(objBook);
Const newObjBook = objBook;
newObjectBook.author = 'Robert';
What are the values of objBook and newObjBook respectively ?

A. {author: "Robert", title: "javaScript}
Undefined
B. {author: "Robert"}
{author: "Robert", title: "javaScript}
C. {author: "Robert", title: "javaScript}
{author: "Robert", title: "javaScript}
D. [title: "javaScript"] [title: "javaScript"]

Answer: D

NEW QUESTION # 117
Refer to the code below:

In which sequence will the number be logged?

A. 0 2 4 1 3
B. 0 1 2 3 4
C. 1 3 0 2 4
D. 0 2 4 3 1

Answer: D

NEW QUESTION # 118
......

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