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| Section | Objectives |
|---|---|
| Topic 1: Asynchronous JavaScript | - Event loop and concurrency model - Error handling in async workflows - Promises and async/await |
| Topic 2: Salesforce Platform Integration | - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage |
| Topic 3: JavaScript Language Fundamentals | - ES6+ syntax and features - Data types, variables, and operators - Functions, scope, and closures |
| Topic 4: Browser and DOM Interaction | - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal - Event handling and propagation |
| Topic 5: Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
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NEW QUESTION # 134
Refer to the code snippet:
01 function getAvailableilityMessage(item) {
02 if (getAvailableility(item)) {
03 var msg = " Username available " ;
04 }
05 return msg;
06 }
What is the return value of msg when getAvailableilityMessage( " newUserName " ) is executed and getAvailableility( " newUserName " ) returns false?
Answer: D
Explanation:
Key details:
* var has function scope , not block scope.
* Declaration var msg is hoisted to the top of the function, but initialization only happens if the if condition is true.
Effectively, the function behaves like:
function getAvailableilityMessage(item) {
var msg; // hoisted declaration
if (getAvailableility(item)) {
msg = " Username available " ;
}
return msg;
}
Now, given:
* getAvailableility( " newUserName " ) returns false.
Execution:
* The if condition is false, so the body does not execute.
* Therefore msg is declared but never assigned .
* In JavaScript, an uninitialized variable that has been declared with var has the value undefined.
Thus:
return msg; // returns undefined
Why other options are wrong:
* A: " newUserName " - msg never receives the parameter value; it ' s only set to " Username available " inside the if, which does not run.
* B: " msg is not defined " - That kind of error occurs if msg were never declared. Here it is declared via var, so it is defined but undefined.
* D: " Username available " - This would require the if branch to run, which it does not when getAvailableility(...) is false.
So the return value is:
undefined
Study Guide Concepts:
* var hoisting and function scope
* Uninitialized variables default to undefined
* Control flow and conditional initialization
NEW QUESTION # 135
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.
What is the value of msg when getAvailableabilityMessage ("newUserName") is executed and get Availability ("newUserName") returns true?
Answer: A
NEW QUESTION # 136
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers
Answer: A,D
NEW QUESTION # 137
Refer to the code below:
Which assertion accurately tests the above code?
Answer: C
NEW QUESTION # 138
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
Answer: C
NEW QUESTION # 139
......
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