JS-Dev-101試験勉強攻略 & JS-Dev-101資格トレーニング

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Browser and Events	17%	- Event handling, propagation, bubbling, and capturing - Browser Developer Tools - DOM manipulation
Testing	7%	- Test-driven development principles - Automated testing strategies - Unit testing with Jest
Asynchronous Programming	13%	- Event loop and asynchronous code execution - Promises and async/await - Callback patterns
Debugging and Error Handling	7%	- Logging strategies and debugging techniques - try-catch blocks
Server Side JavaScript	8%	- Salesforce API integration - Modules and file operations - Node.js applications
Objects, Functions, and Classes	25%	- JavaScript modules (export, import) - Higher-order functions and closures - Object creation, properties, and prototypal inheritance - Function declarations, expressions, and arrow functions - ES6 Classes, constructors, methods, and inheritance
Variables, Types, and Collections	23%	- String manipulation and Date objects - Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - Variable declaration (var, let, const, scoping, hoisting) - Type coercion and type conversion

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JS-Dev-101資格トレーニング & JS-Dev-101ダウンロード

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Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q16-Q21):

質問 # 16
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information thedeveloper has, which code logs an error at boost with an event?

A. Server.on ('error', (error) => {console.log('ERROR', error);});
B. Server.catch ((server) => {console.log('ERROR', error);});
C. Server.error ((server) => {console.log('ERROR', error);});
D. Try{server.start();} catch(error) {console.log('ERROR', error);}

正解：A

質問 # 17
Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers

A. indexedDB
B. localStorage.
C. IIFEs
D. Global variables
E. Cookies

正解：A、B、C

質問 # 18
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. window.addEventListener('onload', personalizeWebsiteContent);
B. document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
C. window.addEventListener('load', personalizeWebsiteContent);
D. document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);

正解：C

解説：
Comprehensive and Detailed Explanation From JavaScript Knowledge:
Two key browser events:
DOMContentLoaded (fired on document):
Fired when the HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subresources to finish loading.
load (fired on window):
Fired when the entire page is fully loaded, including all dependent resources such as stylesheets and images.
The requirement states:
"... when the webpage is fully loaded with HTML content and all related files." That matches the semantics of the load event on the window object.
So the correct code is:
window.addEventListener('load', personalizeWebsiteContent);
Why others are incorrect:
A: DOMContentLoaded fires earlier, when HTML is parsed, but before all related files (images, some styles, etc.) are guaranteed to be loaded.
B: 'onDOMContentLoaded' is not a valid event name; the event is 'DOMContentLoaded'.
D: When using addEventListener, the event type is 'load', not 'onload'. 'onload' is the name of the handler property (window.onload = ...), not the event string.
Relevant concepts: window.load event, DOMContentLoaded, addEventListener syntax, page load lifecycle.
________________________________________

質問 # 19
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN

A. ' 113Nan '
B. 0
C. ' true13 '
D. ' true13NaN '

正解：D

質問 # 20
A 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 formats, what should the new package version number be?

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

正解：C

質問 # 21
......

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