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| Section | Objectives |
|---|---|
| Salesforce Platform Integration | - Lightning Web Components (LWC) Basics - Working with Salesforce Data Models |
| Browser and DOM Interaction | - DOM Manipulation - Events and Event Handling |
| Asynchronous Programming | - Callbacks, Promises, and Async/Await - API Calls and Data Fetching |
| Object-Oriented JavaScript | - Objects and Prototypes - Classes and Inheritance |
| JavaScript Fundamentals | - Functions and Scope - Variables, Data Types, and Operators - Control Flow and Error Handling |
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NEW QUESTION # 98
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
Answer: A
NEW QUESTION # 99
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
Answer: D
Explanation:
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
NEW QUESTION # 100
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
Answer: A
Explanation:
getAttribute('value')
This returns the initial HTML attribute, not the live, updated value.
Even if the user edits the text, the value attribute remains "Hello" because HTML attributes do not update dynamically.
Input elements have a property value that always reflects the live current text inside the field.
So:
input.value
returns the user-entered value.
Therefore, line 04 must use the property, not the attribute:
console.log(input.value);
This ensures the updated input value is displayed.
JavaScript knowledge references (text-only)
HTML attributes are static and retrieved using getAttribute().
DOM element properties (like value) represent the current live state.
Input value changes update the .value property, not the attribute.
NEW QUESTION # 101
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?
Answer: A
NEW QUESTION # 102
A developer wants to use a try...catch statement to catch any error that countSheep() may throw and pass it to a handleError() function.
What is the correct implementation of the try...catch?
Answer: B
Explanation:
Comprehensive and Detailed
Errors thrown inside setTimeout callbacks occur asynchronously, in a different tick of the event loop. A try...catch around setTimeout itself (as in D) cannot catch errors thrown later in the scheduled callback.
To catch errors from countSheep() when it's called asynchronously, the try...catch must wrap the call inside the timeout callback:
setTimeout(function() {
try {
countSheep();
} catch (e) {
handleError(e);
}
}, 1000);
B uses finally incorrectly and references e out of scope.
C is not valid JavaScript syntax.
D's catch can only handle synchronous errors thrown before setTimeout returns, not those thrown inside the callback.
NEW QUESTION # 103
......
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