JavaScript-Developer-I퍼펙트덤프최신버전, JavaScript-Developer-I높은통과율인기시험자료

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

>> JavaScript-Developer-I퍼펙트 덤프 최신버전 <<

JavaScript-Developer-I퍼펙트 덤프 최신버전 완벽한 시험 최신버전 덤프자료 다운

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최신 Salesforce Developer JavaScript-Developer-I 무료샘플문제 (Q29-Q34):

질문 # 29
Given the following code:

What is the output of line 02?

A. "null"
B. "x-
C. "undefined" 0
D. 'object"

정답：D

질문 # 30
Refer to the code:
01 const exec = (item, delay) = >
02 new Promise(resolve = > setTimeout(() = > resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec( ' x ' , ' 100 ' ), exec( ' y ' , ' 500 ' ), exec( ' z ' , ' 100 ' )]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?

A. async runParallel().then(data);
B. runParallel().then(data);
C. runParallel().done(function(data){
return data;
});
D. runParallel().then(function(data){
return data;
});

정답：B,D

설명：
Facts about JavaScript Promises:
* runParallel() is declared async, which means it always returns a Promise .
* Promises are consumed using .then(), .catch(), and .finally().
* There is no .done() method in native JavaScript Promises.
* The async keyword cannot be placed before a function call (option A is invalid syntax).
Analysis of each option:
A). async runParallel().then(data);
Invalid syntax. async cannot prefix an expression.
B). Valid. Calls the function and attaches a .then() handler.
C). Invalid. .done() is not part of JavaScript Promise API.
D). Valid. Calls runParallel() and chains .then().
Therefore the correct answers are B and D.
JavaScript Knowledge References (text-only)
* async functions return Promises.
* Promises use .then() to retrieve resolved values.
* .done() is not part of the standard Promise interface.

질문 # 31
A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

A. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
B. Cookies are read, but the key value is not set because the value is not URL encoded.
C. Cookies are read and the key value is set, and all cookies are wiped.
D. Cookies are read and the key value is set, the remaining cookies are unaffected.

정답：D

질문 # 32
Most accurate tests for:
const arr = Array(5).fill(0);

A. console.assert(arr.length === 0);
B. arr.forEach(e = > console.assert(e === 0));
C. console.assert(arr.length === 5);
D. console.assert(arr[5] === 0 & & arr.length === 0);

정답：B,C

설명：
The correct answers are C and D .
The statement:
const arr = Array(5).fill(0);
creates an array with 5 elements , and every element is filled with the value 0.
So the array becomes:
[0, 0, 0, 0, 0]
A professional test should verify both important expectations:
arr.length === 5
and:
each element === 0
Option C is correct because it checks every element in the array:
arr.forEach(e = > console.assert(e === 0));
This confirms that each array element was filled with 0.
Option D is correct because it checks the array length:
console.assert(arr.length === 5);
This confirms that the array contains exactly five elements.
Option A is incorrect because the array length is not 0; it is 5.
Option B is incorrect for two reasons. First, arr[5] is outside the valid index range. The valid indexes are:
0, 1, 2, 3, 4
So:
arr[5]
returns:
undefined
Second, arr.length === 0 is false because the length is 5.
Therefore, the verified answers are C and D .

질문 # 33
A developer has the function, shown below, that is called when a page loads.

Where can the developer see the log statement after loading the page in the browser?

A. Browser javaScript console
B. Terminal running the web server.
C. On the webpage
D. Browser performance tools

정답：A

질문 # 34
......

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