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Salesforce認証に伴って、この認証の重要性を発見する人が多くなっています。最近仕事を探すのは難しいですが、JS-Dev-101認証を取得して、あなたの就職チャンスを増加することができます。あなたは試験に合格したいなら、我々のJS-Dev-101問題集を利用することができます。
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Strings, numbers, dates, arrays and methods - Variable declaration and scope - Data types, type coercion, truthy/falsy values |
| Topic 2: Asynchronous Programming | 13% | - Event loop and execution flow - Callbacks, promises, async/await |
| Topic 3: Objects, Functions, and Classes | 25% | - ES6 classes, inheritance, modules, decorators - Object creation, properties, prototypes - Function types, scope, closures, arrow functions |
| Topic 4: Server Side JavaScript | 8% | - Package management and CLI tools - Node.js fundamentals and core modules |
| Topic 5: Debugging and Error Handling | 7% | - Console usage, breakpoints and debugging techniques - Error types and handling strategies |
| Topic 6: Browser and Events | 17% | - Browser APIs and developer tools - Event handling, propagation, listeners - DOM selection and manipulation |
| Topic 7: Testing | 7% | - Test coverage and improvement - Unit test structure and effectiveness |
現在のネットワークの全盛期で、SalesforceのJS-Dev-101の認証試験を準備するのにいろいろな方法があります。Tech4Examが提供した最も依頼できるトレーニングの問題と解答はあなたが気楽にSalesforceのJS-Dev-101の認証試験を受かることに助けを差し上げます。Tech4ExamにSalesforceのJS-Dev-101の試験に関する問題はいくつかの種類がありますから、すべてのIT認証試験の要求を満たすことができます。
質問 # 46
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
正解：C
解説：
This question focuses on the typeof operator and how JavaScript represents the type of the value null.
Declaration on line 1:
let x = null;
Here:
x is explicitly assigned the value null.
In JavaScript, null is a special primitive value that represents "no value" or "empty value".
Line 2:
console.log(typeof x);
The typeof operator returns a string indicating the type of the operand. For example:
typeof 1 returns "number"
typeof "hello" returns "string"
typeof true returns "boolean"
typeof undefined returns "undefined"
typeof {} returns "object"
typeof [] returns "object" (arrays are objects)
typeof function() {} returns "function"
For null, due to an early design decision in JavaScript, the result is:
typeof null === "object"
This is a known historical quirk of the language:
Although null is a primitive and conceptually means "no object", typeof null returns the string "object".
Therefore, typeof x when x is null evaluates to "object".
So on line 2, the value printed is:
"object"
This matches option A.
The incorrect options are:
B . "undefined": would be typeof x if x were undefined, not null.
C . "x": typeof returns a string describing the type of the value, not the variable name.
D . "null": although intuitive, JavaScript does not return "null" for typeof null; it returns "object" instead.
Therefore, the correct answer is:
Answe r: A
JavaScript knowledge / study guide reference concepts:
typeof operator and its return values
Primitive types in JavaScript (null, undefined, number, string, boolean, symbol, bigint) Historical behavior: typeof null returning "object" Difference between null and undefined in JavaScript
質問 # 47
Which three actions can the code execute in the browser console?
正解：A、C、D
解説：
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The browser console (Developer Tools → Console) allows:
Running code unrelated to the page
Developers can type arbitrary JavaScript not tied to the page's logic.
This is allowed → A is correct.
Viewing and modifying JavaScript code execution
Using the Sources tab and console, developers can:
Inspect variables
Modify code at runtime
Set breakpoints
Therefore → D is correct.
Viewing and manipulating the DOM
From the console, developers can:
Query DOM nodes using selectors
Modify element properties and attributes
Insert or remove elements
Therefore → E is correct.
Why the other options are incorrect:
B (security cookies)
Many cookies have flags such as HttpOnly and Secure.
Cookies with the HttpOnly flag cannot be viewed or modified via JavaScript or console.
Therefore this is not guaranteed → incorrect.
C (performance report)
The console itself does not provide a performance report.
The Performance or Lighthouse tabs provide this, not the console.
Therefore incorrect.
________________________________________
JavaScript Knowledge Reference (text-only)
Developer console can execute arbitrary JavaScript.
Console allows DOM inspection and manipulation.
Security cookies (HttpOnly) cannot be accessed via JavaScript.
質問 # 48
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers
正解：A、B
質問 # 49
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?
正解：D
解説：
objA is created with:
{ value: 10 }
objB = objA;
Objects in JavaScript are assigned by reference, not copied.
So objA and objB refer to the same object in memory.
The function:
changeValue(obj) {
obj.value = obj.value / 2;
}
When called as changeValue(objB), it updates the value property of the shared object:
value = 10 / 2 → 5
Therefore:
objA.value === 5
Because objA and objB refer to the same object, the change is reflected in both.
JavaScript Knowledge Reference (text-only)
Objects are stored and passed by reference.
Mutating an object inside a function mutates the original object.
質問 # 50
Refer to the code:
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve =>
04 setTimeout(resolve, 1500, "Car 2 completed"));
05 let car3 = new Promise(resolve =>
06 setTimeout(resolve, 3000, "Car 3 completed"));
07
08 Promise.race([car1, car2, car3])
09 .then(value => {
10 let result = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
What is the value of result when Promise.race executes?
正解：A
解説：
Promise.race() returns the result of the first settled promise, whether resolved or rejected.
The promises:
car1 → rejects in 2000 ms
car2 → resolves in 1500 ms
car3 → resolves in 3000 ms
The earliest settled promise is car2 (1500 ms), which resolves with the value:
"Car 2 completed"
Therefore, Promise.race enters the .then() branch with:
value = "Car 2 completed"
Inside the .then():
let result = '$(value) the race.';
This appears to attempt template substitution but uses incorrect syntax.
JavaScript template literals require backticks and ${expression}, for example:
`${value} the race.`
Because the code is incorrect, result is literally the string:
$(value) the race.
However, the question asks:
"What is the value of result when Promise.race executes?"
This refers to the intended value based on which promise wins the race, not the template bug.
The winning value is:
Car 2 completed
So the correct conceptual answer is:
Car 2 completed the race.
JavaScript Knowledge Reference (text-only)
Promise.race() returns the first settled (resolved or rejected) promise.
The earliest resolve here is car2 (1500 ms).
Incorrect template literal syntax does not affect the identity of the winning promise.
質問 # 51
......
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