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| Section | Objectives |
|---|---|
| Asynchronous JavaScript | - Error handling in async workflows - Promises and async/await - Event loop and concurrency model |
| Browser and DOM Interaction | - Browser APIs (fetch, storage, timers) - Event handling and propagation - DOM manipulation and traversal |
| Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| JavaScript Language Fundamentals | - ES6+ syntax and features - Data types, variables, and operators - Functions, scope, and closures |
>> Salesforce JavaScript-Developer-Iサンプル問題集 <<
JavaScript-Developer-I試験の準備中に常に楽観的な心を持ち続けている場合、JavaScript-Developer-I試験に合格し、関連するJavaScript-Developer-I認定を取得することは非常に簡単だと深く信じています。近い将来。もちろん、楽観的な心を保つ方法は多くの人が答えるのが非常に難しい質問であることも知っています。私たちに知られているように、意志があるところには方法があります。この分野の専門家であるため、JavaScript-Developer-I試験問題の助けを借りて素晴らしい結果が得られると信じています。
質問 # 65
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript TO ensure that visitors have a good experience, a script named personaliseContext needs to be executed when the webpage is fully loaded (HTML content and all related files ), in order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
正解：A
質問 # 66
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?
正解：C
質問 # 67
A developer implements a function that adds a few values.
Function sum(num) {
If (num == undefined) {
Num =0;
}
Return function( num2, num3){
If (num3 === undefined) {
Num3 =0 ;
}
Return num + num2 + num3;
}
}
Which three options can the developer invoke for this function to get a return value of 10 ?
Choose 3 answers
正解：A、C
質問 # 68
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
正解：C
解説：
質問 # 69
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：A、B
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:
The answer: B, D
References 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 # 70
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