JS-Dev-101合格問題、JS-Dev-101試験準備

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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	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
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	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.
トピック 4	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
トピック 5	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

>> JS-Dev-101合格問題 <<

JS-Dev-101試験準備、JS-Dev-101合格記

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Salesforce Certified JavaScript Developer - Multiple Choice 認定 JS-Dev-101 試験問題 (Q68-Q73):

質問 # 68
HTML:
<p> The current status of an Order: <span id="status"> In Progress </span> </p> Which JavaScript statement changes 'In Progress' to 'Completed'?

A. document.getElementById(".status").innerHTML = 'Completed';
B. document.getElementById("status").Value = 'Completed';
C. document.getElementById("#status").innerHTML = 'Completed';
D. document.getElementById("status").innerHTML = 'Completed';

正解：D

解説：
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge To select an element by ID, JavaScript uses:
document.getElementById("status")
The ID must be passed without any selector prefixes (no dot, no hash).
Then, to update the text inside:
element.innerHTML = 'Completed';
Why the others are wrong:
A uses ".status" which would match a CSS class, not an ID.
B incorrectly prepends #, which is used in CSS selectors but not in getElementById.
D attempts to use .Value with capital V, which is incorrect for DOM text; .value only applies to form elements.
Thus, option C is correct.
________________________________________
JavaScript Knowledge Reference (text-only)
getElementById takes a raw ID string with no prefixes.
innerHTML updates an element's displayed HTML content.

質問 # 69
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an event and start the web server ?

A. server()
B. console.log( 'Listening on ', port) ;
C. server.on(' connect ' , ( port) => {console.log('Listening on ' , port) ;})
D. serve(( port) => (
E. Server.start ();

正解：C

質問 # 70
Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A. document. querySelectorAll('#row-uc') -classList.add("priority-accour');
B. document. queryselector('#row-uc').ClassList.add('priority-account');
C. document. querySelector (#row-uc').classes-push('priority-account');
D. document. getElementByid('row-uc').addClass('priority-account*);

正解：B

質問 # 71
CRefer to the code below:
```javascript
let strNumber = '12345';
```
Which code snippet shows a correct way to convert this string to an integer?

A. let numberValue = Number(textVelue);
B. let numberValue = (stunber) textveluer
C. let numberValue = textvalue.cornteger();
D. let numberValue = Integer(strNumber);

正解：A

質問 # 72
Console logging methods that allow string substitution:

A. message
B. assert
C. error
D. info
E. log

正解：B、C、D、E

解説：
The correct answers are B, C, D, and E.
JavaScript browser consoles support string substitution in several console output methods. String substitution means using placeholders such as:
%s
%d
%i
%f
%o
%O
%c
Example:
console.log("User name is %s and age is %d", "Alex", 25);
Output:
User name is Alex and age is 25
The valid console methods from the given options are:
Option
Method
Correct?
Reason
A
message
No
console.message() is not a standard console method.
B
log
Yes
console.log() supports formatted string substitution.
C
assert
Yes
console.assert() can output a formatted message when the assertion is false.
D
info
Yes
console.info() supports formatted output like console.log().
E
error
Yes
console.error() supports formatted output and displays an error-style message.
Example with these valid methods:
console.log("Name: %s", "John");
console.info("Score: %d", 95);
console.error("Error code: %d", 500);
console.assert(false, "Failed check for user: %s", "Admin");
So the verified answers are B, C, D, and E.

質問 # 73
......

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