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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer - Multiple Choice
Exam Number:	JS-Dev-101
Related Certifications:	Salesforce Certified Developer Salesforce Certified Platform Developer I
Certificate Validity Period:	Does not expire; requires maintenance updates
Passing Score:	65%
Exam Price:	USD 200
Available Languages:	Japanese, English
Exam Duration:	105 minutes
Real Exam Qty:	60 scored + up to 5 unscored
Exam Format:	Multiple select, Multiple choice
Recommended Training:	Trailhead JavaScript Developer I Certification Prep
Exam Registration:	Salesforce Certification Registration
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online proctored or onsite at authorized testing centers
Pre Condition:	No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity
Official Syllabus URL:	https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

>> JS-Dev-101トレーニング費用 <<

JS-Dev-101模擬モード、JS-Dev-101全真問題集

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Salesforce JS-Dev-101 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
トピック 2	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
トピック 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
トピック 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
トピック 5	Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy falsy evaluations.

Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q48-Q53):

質問 # 48
Function to test:
01 const sum3 = (arr) => {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1];
05 return arr[0] + arr[1] + arr[2];
06 };
Which two assert statements are valid tests for this function?

A. console.assert(sum3([0]) === 0);
B. sum3([0])
C. console.assert(sum3([-3, 2]) === -1);
D. console.assert(sum3([1, '2']) == 12);
E. console.assert(sum3(['hello', 2, 3, 4]) === NaN);

正解：A、C

解説：
Length 1 → returns arr[0] → 0.
Assertion: 0 === 0 → true.
Also a correct and meaningful test.
Therefore, the valid and logically correct tests here are C and D.
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Evaluate each test:
A). sum3([1, '2'])
Array length is 2 → line 4: arr[0] + arr[1] → 1 + '2' → '12' (string).
Assertion: '12' == 12 is true (type coercion).
However, this "test" is not logically correct: a numeric sum function should not be expected to return '12' as a string. It passes only because of weak equality coercion, so it is not a good/valid test of correct behavior.
B). sum3(['hello', 2, 3, 4])
Length ≥ 3 → line 5: 'hello' + 2 + 3 → 'hello2' + 3 → 'hello23'.
'hello23' === NaN is always false because NaN is never equal to anything, not even itself.
This assertion fails and also misunderstands how NaN comparisons work.
C). sum3([-3, 2])
Length 2 → -3 + 2 = -1.
Assertion: -1 === -1 → true.
This is a correct and meaningful test.

質問 # 49
Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?

A. let numberValue = (number) textValue;
B. let numberValue = Number(strNumber);
C. let numberValue = textValue.toInteger();
D. let numberValue = Integer(strNumber);

正解：B

解説：
The correct answer is C.
The original option contains a typing error. It should use the existing variable name:
let numberValue = Number(strNumber);
The value of strNumber is a string:
'12345'
Using Number() converts the numeric string into a JavaScript number:
12345
So after execution:
typeof numberValue;
returns:
"number"
Professional review of each option:
Option
Result
Explanation:
A
Incorrect
JavaScript does not have a standard global Integer() conversion function.
B
Incorrect
Strings do not have a standard .toInteger() method.
C
Correct
Number(strNumber) correctly converts '12345' into 12345.
D
Incorrect
This is not valid JavaScript casting syntax.
A commonly used alternative would also be:
let numberValue = parseInt(strNumber, 10);
But from the provided answer choices, the verified answer is C.

質問 # 50
Refer to code below:
Let first = 'who';
Let second = 'what';
Try{
Try{
Throw new error('Sad trombone');
}catch (err){
First ='Why';
}finally {
Second ='when';
} catch (err) {
Second ='Where';
}
What are the values for first and second once the code executes ?

A. First is Who and second is When
B. First is who and second is where
C. First is why and second is when
D. First is why and second is where

正解：C

質問 # 51
Refer to the code below:
```html
<html>
<body>
<div id="logo">Hello Logo!</div>
<button id="test">Click me</button>
</body>
<script>
function printMessage() {
console.log('This is a test message');
}
let el = document.getElementById('test');
el.addEventListener("click", printMessage, false);
</script>
</html>

A. Add event. removefventListener(); 10 window. onLoad event handier
B. Add event.stoppropagation(); to winontdoado evewnt handier
C. Add event. removetventiistener(); tO printlessage function
D. Add event. stopPropagation(); 10 printivessage function

正解：D

質問 # 52
What are two unique features of fat-arrow functions compared to normal function definitions?

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

正解：A、D

解説：
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.

質問 # 53
......

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