JavaScript-Developer-I最速合格を読むと、Salesforce Certified JavaScript Developer (JS-Dev-101)の半分を合格したことを意味します

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) 認定 JavaScript-Developer-I 試験問題 (Q108-Q113):

質問 # 108
Which two options are core Node.js modules?
Choose 2 answers

正解：A、C


質問 # 109
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?

正解：D、E


質問 # 110
A developer creates a simple webpage with an input filed. When a user enters text In the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:

The developer wrote the JavaScript code below:

When the user clicks the button, the output is always ''hello''.
What needs to be done to make this code work as expected?

正解：C


質問 # 111
Refer to the code below:
01 const objBook = {
02 title: ' JavaScript ' ,
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = ' Robert ' ;
What are the values of objBook and newObjBook respectively?

正解：D

解説：
* Object.preventExtensions(obj) This built-in JavaScript method marks an object so that no new properties can be added to it. Existing properties can still be read and updated, but adding new ones is disallowed.
* const newObjBook = objBook; Both variables reference the same object in memory. JavaScript objects are assigned by reference, not copied.
* newObjBook.author = " Robert " ; Because the object has been marked as non-extensible, JavaScript will not allow new properties to be added. The behavior depends on mode:
* In non-strict mode: the assignment silently fails and does nothing.
* In strict mode: this would throw a TypeError.
Since nothing indicates strict mode, this is non-strict behavior, making the assignment fail silently.
Therefore, the object remains:
{ title: " JavaScript " }
Both objBook and newObjBook point to the same unchanged object.
This matches option A.
JavaScript knowledge references (text-only)
* Object.preventExtensions() prevents adding new properties.
* Assigning an object to another variable copies the reference, not the object.
* Adding a property to a non-extensible object silently fails in non-strict mode.


質問 # 112
Refer to the code snippet:

A developer writes this code to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
What is the return of msg when getivelibilityMessage ('' bewUserName') is executed and getAvailability (''newUserName'') returns false?

正解：B


質問 # 113
......

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