Salesforce JS-Dev-101시험대비덤프공부 - JS-Dev-101덤프문제집

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JS-Dev-101시험대비 덤프공부, JS-Dev-101덤프문제집, JS-Dev-101적중율 높은 인증덤프공부, JS-Dev-101시험대비 최신 덤프공부, JS-Dev-101인증덤프 샘플체험

참고: DumpTOP에서 Google Drive로 공유하는 무료 2026 Salesforce JS-Dev-101 시험 문제집이 있습니다: https://drive.google.com/open?id=1NcwHEJ2bOH46SqPuicMLfKh0IrykYY1m

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Salesforce JS-Dev-101 시험요강:

주제 소개
주제 1
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
주제 2
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
주제 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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최신 Salesforce Developers JS-Dev-101 무료샘플문제 (Q17-Q22):

질문 # 17
A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the function to run once after five seconds.
What is the correct syntax toschedule this function?

  • A. setTimeout ('formatName', 5000, 'John", "Doe');
  • B. setTimeout (formatName(), 5000, "John", "BDoe");
  • C. setTimout(() => { formatName("John', 'Doe') }, 5000);
  • D. setTimeout (formatName('John', ''Doe'), 5000);

정답：A


질문 # 18
Refer to the HTML below:

Which JavaScript statement results in changing " The Lion."?

  • A. document.querySelector('$main li:second-child').innerHTML = "The Lion ';
  • B. document.querySelector('$main li:nth-child(2)'),innerHTML = " The Lion. ';
  • C. document.querySelector('$main li.Tony').innerHTML = '" The Lion ';
  • D. document.querySelectorAll('$main $TONY').innerHTML = '" The Lion

정답：D


질문 # 19
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 receives an argument called parentThis, giving the enclosing lexical scope.
  • C. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.
  • D. The function generates its own this making it useful for separating scope.

정답：A,C

설명：
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 Reference (text-only)
Arrow functions have lexical this binding.
Arrow functions support implicit return for single expressions.


질문 # 20
Given the code below:
01 setTimeout(() => {
02 console.log(1);
03 }, 1100);
04 console.log(2);
05 new Promise((resolve, reject) => {
06 setTimeout(() => {
07 reject(console.log(3));
08 }, 1000);
09 }).catch(() => {
10 console.log(4);
11 });
12 console.log(5);
What is logged to the console?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

정답：D

설명：
Comprehensive and Detailed Explanation From JavaScript Knowledge:
We must track synchronous code, setTimeout callbacks (macrotasks), and Promise rejection handling (microtasks).
Step-by-step:
Synchronous code first:
Line 01-03: Schedules a timeout at 1100 ms: logs 1 (later).
Line 04: console.log(2); → logs 2.
Lines 05-09: Construct a new Promise.
The executor runs immediately.
Inside it, another setTimeout is set for 1000 ms:
setTimeout(() => {
reject(console.log(3));
}, 1000);
Line 09-11: .catch(() => { console.log(4); }) attached to the promise.
Line 12: console.log(5); → logs 5.
So after all synchronous code, the console has:
2
5
At 1000 ms: inner setTimeout fires
The callback:
() => {
reject(console.log(3));
}
Inside:
console.log(3) runs first, logging 3.
console.log(3) returns undefined.
Then reject(undefined) is called.
So at about 1000 ms, we log:
3
When the promise is rejected:
The .catch handler is scheduled as a microtask.
After the current macrotask (the timeout callback) completes, the microtask queue runs.
Thus .catch(() => { console.log(4); }) runs shortly after, in the same 1000 ms tick.
So immediately after 3, the catch handler logs:
4
Now the logs in order are:
2
5
3
4
At 1100 ms: outer setTimeout fires
The callback from line 01 runs:
console.log(1);
Logs: 1.
Final log order:
2 (line 4, sync)
5 (line 12, sync)
3 (1000 ms timeout, then inside logs before reject)
4 (promise catch microtask after rejection)
1 (1100 ms timeout)
Concatenated: 25341.
Therefore, the correct option is:
Study Guide / Concept Reference (no links):
Event loop: call stack, macrotask queue (timers), microtask queue (promises) setTimeout scheduling and ordering Promise rejection, .catch, and microtasks Evaluation order of function arguments (reject(console.log(3)))
________________________________________


질문 # 21
Refer to the code below:
01 const myFunction = arr => {
02 return arr.reduce((result, current) => {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?

  • A. Returns 5 ← (Text here appears to be a typo; correct value is 10, see explanation.)
  • B. Returns NaN
  • C. Returns 0
  • D. Throws an error

정답：A

설명：
We call:
myFunction([]);
Inside:
arr.reduce((result, current) => {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
Signature: array.reduce(callback, initialValue)
If initialValue is provided and the array is empty, reduce:
Does not call the callback at all.
Simply returns initialValue.
Here:
arr is [] (empty).
initialValue is 10.
So:
No iterations of the callback happen (no elements to process).
The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
A: 0 - incorrect, because the initial value is 10, not 0.
B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10. The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
Answe r: D
Study Guide / Concept Reference (no links):
Array.prototype.reduce behavior with initialValue
Behavior of reduce on an empty array with and without initialValue
Return value when no iterations run


질문 # 22
......

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2026 DumpTOP 최신 JS-Dev-101 PDF 버전 시험 문제집과 JS-Dev-101 시험 문제 및 답변 무료 공유: https://drive.google.com/open?id=1NcwHEJ2bOH46SqPuicMLfKh0IrykYY1m

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