BONUS！！！ Pass4Test JS-Dev-101ダンプの一部を無料でダウンロード：https://drive.google.com/open?id=1AXOsPhx76IufAhCeX_Kt2NCJju0dLnGS
JS-Dev-101の有用なテストガイド資料は、最も重要な情報を最も簡単な方法でクライアントに提示するため、JS-Dev-101の有用なテストガイドを学習するための時間とエネルギーはほとんど必要ありません。クライアントは、テストの学習と準備に20〜30時間しかかかりません。仕事や学習などで忙しい人にとっては、これは良いニュースです。なぜなら、テストの準備に十分な時間がないことを心配する必要がなく、主なことをゆっくりとできるからです。 JS-Dev-101学習実践ガイドをご覧ください。ですから、JS-Dev-101試験の教材の大きな利点であり、クライアントにとって非常に便利です。
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I - Multiple Choice Exam (JS-Dev-101) |
| Exam Number: | JS-Dev-101 |
| Exam Format: | Multiple Choice Questions, Multiple Select Questions |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Real Exam Qty: | 60 (multiple choice) |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Related Certifications: | Salesforce Platform Developer II Salesforce Platform Developer I |
| Certificate Validity Period: | 1 year (maintenance required annually in Salesforce certification program) |
| Recommended Training: | MDN Web Docs - JavaScript Guide Salesforce Trailhead - JavaScript Developer I |
| Exam Registration: | Kryterion Webassessor (Exam Delivery) Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored exam via Salesforce authorized testing platform (e.g., Webassessor) |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and web development is recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper |
>> Salesforce JS-Dev-101資格関連題 <<
JS-Dev-101試験問題の継続的な刷新により、当社は大きな市場シェアを占めています。強力な研究センターを構築し、JS-Dev-101トレーニングガイドでより良い仕事をするために強力なチームを所有しています。Salesforceこれまで、JS-Dev-101学習教材に関する多くの特許を取得しています。一方で、当社は改修の恩恵を受けています。お客様は当社の製品を選択する可能性が高くなります。一方、私たちが投資したお金は有意義なものであり、JS-Dev-101試験の新しい学習スタイルを刷新するのに役立ちます。
| トピック | 出題範囲 |
|---|---|
| トピック 1 |
|
| トピック 2 |
|
| トピック 3 |
|
| トピック 4 |
|
| トピック 5 |
|
質問 # 14
Which function should a developer use to repeatedly execute code at a fixed interval ?
正解：A
質問 # 15
Refer to the following code:
```html
<html lang="en">
<body>
<button class="secondary">Save draft</button>
<button class="primary">Save and close</button>
</body>
<script>
function displaySaveMessage(event) {
console.log('Save message.');
}
function displaySuccessMessage(event) {
console.log('Success message.');
}
window.onload = function() {
document.querySelector('.secondary')
.addEventListener('click', displaySaveMessage, true);
document.querySelector('.primary')
.addEventListener('click', displaySuccessMessage, true);
}
</script>
</html>
正解：D
質問 # 16
A developer has two ways to write a function:
Option A:
function Monster(){
this.growl = ()=>{
console.log('Grr!');
}
}
Option B:
function Monster(){};
Monster.prototype.growl = ()=>{
console.log('Grr!');
}
After deciding on an option, the developercreates 1000 monster objects.
How many growl methods are created with Option A and Option B?
正解：A
質問 # 17
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById('carSpeed');
06 debugger;
07 let fourWheels = new Car(carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console?
正解：C、D
解説：
When execution hits the debugger; statement on line 06, JavaScript execution pauses at that point. Most modern browsers (for example, using DevTools) allow you to inspect the current scope, DOM, and various browser APIs in the console.
Let's look at what is available precisely at line 06.
Current code state at the breakpoint:
Lines 01-04 define the Car constructor function.
Line 05 executes:
let carSpeed = document.getElementById('carSpeed');
So at line 06:
carSpeed is a variable containing a reference to a DOM element (the element with id "carSpeed").
Line 07 has not executed yet:
let fourWheels = new Car(carSpeed.value, 'red');
So fourWheels has not been created and is not accessible yet (it is in the temporal dead zone for the let declaration).
Now check each option:
Option A:
"A variable displaying the number of instances created for the Car object" This code does not implement any mechanism to count instances of Car.
There is no static property, global counter, or similar variable tracking the number of Car instances.
At line 06, no instance of Car has even been created yet (new Car(...) is on line 07, which has not run).
Therefore, there is no such variable by default in JavaScript or DevTools.
This option is not available.
Option B:
"The information stored in the window.localStorage property"
At a breakpoint, the console is fully usable to inspect global objects.
window.localStorage is always accessible from the console (assuming standard browser context).
You can type:
window.localStorage
and inspect key/value pairs stored there.
This is independent of the current function or breakpoint line; localStorage is part of the Web Storage API on the window object.
So this information is indeed available in the console at line 06.
Option C:
"The values of the carSpeed and fourWheels variables"
At line 06:
carSpeed has been declared and assigned (line 05), so it is available, and its value (a DOM element) can be inspected.
fourWheels is declared on line 07 with let and has not yet been executed.
Variables declared with let and const are in a temporal dead zone before their declaration line completes.
At line 06, fourWheels is not yet initialized, and attempting to access it would result in a ReferenceError.
Thus, you can inspect carSpeed but not fourWheels. The option explicitly says "the values of the carSpeed and fourWheels variables", which is not correct at this breakpoint, because fourWheels is not available yet.
Option D:
"The style, event listeners and other attributes applied to the carSpeed DOM element" carSpeed holds a reference to a DOM element (document.getElementById('carSpeed')).
In DevTools, you can inspect this element in several ways:
Typing carSpeed in the console.
Inspecting it in the Elements panel.
From the console or Elements panel, you can view:
Its style (inline styles and computed styles).
Event listeners attached to it (using event listener viewer in DevTools).
Other attributes (id, class, etc.).
All of this is accessible at the point where execution is paused.
Therefore, this information is available at the breakpoint.
Conclusion:
B is available (global window.localStorage).
D is available (full inspection of the carSpeed DOM element).
A is not present in this code or environment.
C is partially wrong (only carSpeed exists; fourWheels does not yet).
So the two correct answers are:
Answe r: B, D
Reference of JavaScript knowledge documents or Study Guide (concept names only):
debugger statement and pausing execution
JavaScript execution context and scope at a breakpoint
let declarations and temporal dead zone
Browser DevTools console and inspection of variables
DOM access via document.getElementById and inspection of elements
Web Storage API: window.localStorage
質問 # 18
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
正解：A
解説：
We must understand pass-by-value for primitives in JavaScript.
Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
a is 10
b is 10 (independent copy)
Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
param receives the value of b, which is 10.
Inside the function, param is a local variable.
param = 5; changes only this local copy.
It does not affect b outside the function.
After the function call:
a is still 10.
b is still 10.
Result:
const result = a + ' - ' + b;
a is 10.
b is 10.
String concatenation: '10 - 10'.
So result is:
"10 - 10"
Therefore, the correct option is:
Study Guide Concepts:
Primitive values (numbers, strings, booleans) are passed by value
Function parameters as local variables
String concatenation with +
Difference between mutating references vs primitives
質問 # 19
......
JS-Dev-101試験概要: https://www.pass4test.jp/JS-Dev-101.html
P.S. Pass4TestがGoogle Driveで共有している無料かつ新しいJS-Dev-101ダンプ：https://drive.google.com/open?id=1AXOsPhx76IufAhCeX_Kt2NCJju0dLnGS