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| Section | Objectives |
|---|---|
| Asynchronous JavaScript | - Event loop and concurrency model - Promises and async/await - Error handling in async workflows |
| Browser and DOM Interaction | - DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers) |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript |
| JavaScript Language Fundamentals | - Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features |
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NEW QUESTION # 48
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function?
Choose 2 answers
Answer: A,B
NEW QUESTION # 49
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
Answer: B
NEW QUESTION # 50
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers
Answer: B,D
NEW QUESTION # 51
Refer to the code below:
01 x = 3.14;
02
03 function myFunction() {
04 ' use strict ' ;
05 y = x;
06 }
07
08 z = x;
09 myFunction();
Considering the implications of ' use strict ' on line 04, which three statements describe the execution of the code?
Answer: A,B,C
Explanation:
* Behavior of non-strict global code The script does not begin with a ' use strict ' directive at the top level, so the global code (outside any function) runs in non-strict (sloppy) mode.
* Line 01: x = 3.14; In non-strict mode, assigning to an undeclared identifier (no var, let, or const) creates an implicit global variable. So after line 01, x exists and equals 3.14.
* Line 08: z = x; This also runs in non-strict mode. Since x is already defined (from line 01), z is set to
3.14. Therefore, statement B is correct: z is equal to 3.14.
* Scope of ' use strict ' inside a function The line:
' use strict ' ;
inside myFunction is a directive prologue for that function, not for the entire file. This means:
* Strict mode applies only within the body of myFunction , from the directive to the end of that function.
* It does not retroactively affect code before the function or code outside of it.
Therefore:
* Statement A is incorrect: ' use strict ' is not "hoisted" to affect the whole file. It only affects the function body.
* Statement C is incorrect: strict mode does not apply from line 04 to the end of the file; it only applies within myFunction, not to global lines like 01, 08, or 09.
* Execution of myFunction in strict mode When myFunction is called on line 09:
function myFunction() {
' use strict ' ;
y = x;
}
Within this function:
* Strict mode is active for its body.
* In strict mode, assigning to an undeclared variable (like y here) is not allowed and results in a ReferenceError at runtime.
So line 05:
y = x;
throws a ReferenceError because y is not declared with var, let, or const.
Therefore, statement E is correct: line 05 throws an error.
* Why statement D is considered correct Statement D says: ' use strict ' has an effect only on line 05.
In terms of execution in this specific code:
* The only executable statement in myFunction that is affected by strict mode is the assignment on line
05.
* The directive itself on line 04 is not a "normal" runtime operation; it is a directive that sets the mode.
* There are no other statements inside the function that behave differently under strict mode; only the line that assigns to the undeclared variable shows a strict-mode effect.
So, describing the practical execution behavior of this snippet, strict mode manifests its effect only on line 05, making statement D correct in this context.
Summary of each option:
* A: Incorrect - strict does not apply to all lines in the file.
* B: Correct - z becomes 3.14 in non-strict global code.
* C: Incorrect - strict does not affect code outside the function.
* D: Correct - in this code, the only behavioral effect of strict mode is on line 05.
* E: Correct - line 05 throws a ReferenceError due to assignment to undeclared y under strict mode.
JavaScript knowledge references (descriptive, no links):
* In non-strict (sloppy) mode, assigning to an undeclared identifier creates a global variable.
* ' use strict ' inside a function body enables strict mode for that function only.
* In strict mode, assigning to an undeclared variable results in a ReferenceError.
* Directive prologues ( ' use strict ' ) affect only their containing function or script, not other scopes.
NEW QUESTION # 52
Refer to the following code:
< html lang= " en " >
< body >
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
< /body >
< script >
function displaySaveMessage(event) {
console.log( ' Save message. ' );
}
function displaySuccessMessage(event) {
console.log( ' Success message. ' );
}
window.onload = function() {
document.querySelector( ' .secondary ' )
.addEventListener( ' click ' , displaySaveMessage, true);
document.querySelector( ' .primary ' )
.addEventListener( ' click ' , displaySuccessMessage, true);
}
< /script >
< /html >
Answer: C
Explanation:
The answer choices appear to belong to an event propagation question using nested elements such as an outer element and an inner element.
The important clue is this third argument:
addEventListener( ' click ' , handlerFunction, true);
When the third argument is true, the event listener runs during the capturing phase .
In event capturing, the browser handles the event from the outside toward the inside:
Outer element # Inner element
So, if an inner element is clicked and both the outer and inner elements have click listeners registered with capture mode set to true, the outer listener runs first, then the inner listener runs.
That produces:
Outer message
Inner message
So the matching option is B .
Important correction:
In the exact code shown, the buttons are sibling elements:
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
They are not nested inside one another. Therefore, with the code exactly as written:
Clicking the secondary button logs:
Save message.
Clicking the primary button logs:
Success message.
However, because the provided answer choices refer to Outer message and Inner message , the intended concept is clearly event capturing. In a capturing-phase question with nested outer and inner elements, the correct order is:
Outer message
Inner message
Therefore, the verified answer for the intended event-capturing question is B .
NEW QUESTION # 53
......
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