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| Section | Objectives |
|---|---|
| Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
| Browser and DOM Interaction | - DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers) |
| JavaScript Language Fundamentals | - Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features |
| Asynchronous JavaScript | - Event loop and concurrency model - Error handling in async workflows - Promises and async/await |
| Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript |
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NEW QUESTION # 128
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
Answer: A,C
NEW QUESTION # 129
Refer to the following array:
let arr = [1, 2, 3, 4, 5];
Which two lines of code result in a second array, arr2, created such that arr2 is a reference to arr?
Answer: A,B
Explanation:
The correct answers are C and D .
Arrays in JavaScript are objects. When an array variable is assigned directly to another variable, both variables point to the same array in memory.
Option C is correct:
let arr2 = arr;
This does not create a new array. It creates another reference to the same array.
Example:
arr2.push(6);
console.log(arr);
Output:
[1, 2, 3, 4, 5, 6]
Changing arr2 also affects arr because both variables reference the same array.
Option D is also correct:
let arr2 = arr.sort();
The sort() method sorts the array in place and returns the same array reference. Therefore, arr2 refers to the same array object as arr.
The incorrect options create copies:
let arr2 = arr.slice(0, 5);
creates a shallow copy.
let arr2 = Array.from(arr);
also creates a new shallow copy.
So the two lines that make arr2 reference the original arr are C and D .
NEW QUESTION # 130
Refer to the code below:
01 < html lang= " en " >
02 < table onclick= " console.log( ' Table log ' ); " >
03 < tr id= " row1 " >
04 < td > Click me! < /td >
05 < /tr >
06 < /table >
07 < script >
08 function printMessage(event) {
09 console.log( ' Row log ' );
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById( ' row1 ' );
14 elem.addEventListener( ' click ' , printMessage, false);
15 < /script >
16 < /html >
Which code change should be done for the console to log the following when " Click me! " is clicked?
Row log
Table log
Answer: A
Explanation:
Current behavior:
* Clicking < td > triggers the click event on row1, then bubbles up to < table > .
* printMessage runs, logs " Row log " , then event.stopPropagation() stops the event from bubbling to the table.
* So " Table log " never appears.
To allow the table's inline onclick to run after the row handler:
* Remove the propagation stop:
function printMessage(event) {
console.log( ' Row log ' );
// event.stopPropagation(); // remove this
}
Now the event bubbles:
* printMessage logs " Row log " .
* The table's onclick runs, logging " Table log " .
Option A only changes capture/bubble phase but still stops propagation. C does nothing meaningful (stopPropagation takes no arguments). B removes the row handler entirely.
NEW QUESTION # 131
A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: B
NEW QUESTION # 132
Which javascript methods can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
Answer: B
NEW QUESTION # 133
......
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