JavaScript-Developer-I受験資格 & JavaScript-Developer-I日本語認定

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

>> JavaScript-Developer-I受験資格 <<

JavaScript-Developer-I日本語認定、JavaScript-Developer-I認定デベロッパー

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Salesforce Certified JavaScript Developer (JS-Dev-101) 認定 JavaScript-Developer-I 試験問題 (Q57-Q62):

質問 # 57
Refer to the code below:

Line 05 causes an error.
What are the values of greeting and salutation once code completes?

A. Greeting is Goodbye and salutation is I say Hello.
B. Greeting is Hello and salutation is I say hello.
C. Greeting is Hello and salutation is Hello, Hello.
D. Greeting is Goodbye and salutation is Hello, Hello.

正解：C

質問 # 58
Refer to the following code:
01 function Tiger(){
02 this.Type = 'Cat';
03 this.size = 'large';
04 }
05
06 let tony = new Tiger();
07 tony.roar = () =>{
08 console.log('They\'re great1');
09 };
10
11 function Lion(){
12 this.type = 'Cat';
13 this.size = 'large';
14 }
15
16 let leo = new Lion();
17 //Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers.

A. Object.assign(leo,tony);
B. Leo.roar = () => { console.log('They\'re pretty good:'); };
C. Leo.prototype.roar = () => { console.log('They\'re pretty good:'); };
D. Object.assign(leo,Tiger);

正解：A、B

質問 # 59
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?

A. Message
B. Info
C. Error
D. Assert
E. Log

正解：B、C、E

質問 # 60
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server, js file will start the server. the developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?

A. node start inspect server,js
B. node inspect server,js
C. node server,js inspect
D. node -i server.js

正解：B

質問 # 61
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers

A. { type : 'update', recordId : '123abc' }
B. 'Update' , (
recordId : '123abc'
(
C. 'Update' , '123abc'
D. 'Update' , {
Details : {
recordId : '123abc'

正解：B、D

解説：
}
}

質問 # 62
......

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