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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Price: | USD 200 (+ applicable taxes) |
| Exam Format: | Multiple-choice, Multiple-select |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Available Languages: | Japanese, English |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
>> JavaScript-Developer-Iミシュレーション問題 <<
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質問 # 44
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person( ' John ' , ' john@email.com ' );
07 const jane = new Person( ' Jane ' , ' jane@email.com ' );
08 const emily = new Person( ' Emily ' , ' emily@email.com ' );
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
正解：D
解説：
We have an array of plain objects:
[
{ name: ' John ' , email: ' john@email.com ' },
{ name: ' Jane ' , email: ' jane@email.com ' },
{ name: ' Emily ' , email: ' emily@email.com ' }
]
We want:
* A "visual representation" of the list.
* Ability to sort by name or email in DevTools.
console.table:
* console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
* Each object becomes a row; properties (name, email) become columns.
* Many DevTools UIs allow:
* Clicking column headers to sort by that column.
* Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
* console.group(usersList);
* Starts a console group. The argument is just logged as a line label.
* It does not create a table or sortable view; it just groups subsequent logs.
* console.groupCollapsed(usersList);
* Same grouping behavior, but collapsed by default.
* Again, no table or sortable columns.
* console.info(usersList);
* Logs the array in the console, but as a standard log/info.
* You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
The answer: A
Study Guide / Concept References (no links):
* console.table for tabular logging
* console.group and console.groupCollapsed for grouped logs
* console.log / console.info standard logging behavior
* DevTools UI support for sorting columns in console.table
質問 # 45
Refer to the following code block:
What is the value of output after the code executes?
正解：D
質問 # 46
Given a value, which two options can a developer use to detect if the value is NaN?
正解：C、D
解説：
We already know NaN is special: it is not equal to itself.
Check each:
* A. value === Number.NaN
* Number.NaN is NaN.
* NaN === NaN is always false.
* This will never be true; cannot reliably detect NaN.
* B. value == NaN
* NaN == NaN is also always false.
* Again, this never detects NaN.
* C. isNaN(value)
* Global isNaN converts its argument to a number and then checks if the result is NaN.
* This can detect NaN, but it may also return true for non-number values that coerce to NaN, such as isNaN( ' foo ' ).
* Regardless, it is a standard way to detect if a value is "NaN-like" in JavaScript.
* D. Object.is(value, NaN)
* Object.is(NaN, NaN) returns true.
* This is a strict way to detect a value that is exactly NaN (no coercion).
Therefore, among the given choices, the two viable ways to detect NaN are:
* isNaN(value)
* Object.is(value, NaN)
質問 # 47
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done make this code work as expected?
正解：C
質問 # 48
Given the code below:
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
正解：B
質問 # 49
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