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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 2
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.
Topic 4
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 5
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q14-Q19):

NEW QUESTION # 14
Refer to the string below.
Const str='Salesforce';
Which two statementsresults in the word 'Sales'?

Answer:

Explanation:
See the Answer below in explanation


NEW QUESTION # 15
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString && searchString.toLowerCase();
03 document.querySelectorAll('.account').forEach(account => {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Line 05 uses the conditional (ternary) operator:
condition ? valueIfTrue : valueIfFalse
In this specific code:
account.style.display = accountName.includes(parsedSearchString)
? /* valueIfTrue */
: /* valueIfFalse */;
accountName.includes(parsedSearchString) returns:
true if the accountName string contains the parsedSearchString,
false otherwise.
The requirement is:
Hide accounts that do not match the search string.
That means:
If the account name includes the search string → it should be visible.
If the account name does not include the search string → it should be hidden.
The relevant property is:
account.style.display
For the display property:
Common values for showing elements:
'block', 'inline', 'inline-block', etc.
Common value for hiding elements:
'none' (element is not rendered and takes up no space).
So we want:
When accountName.includes(parsedSearchString) is true → show the element, e.g. display = 'block'.
When false → hide the element, display = 'none'.
Therefore the assignment should be:
account.style.display = accountName.includes(parsedSearchString) ? 'block' : 'none'; This matches option A:
'block' : 'none'
Why other options are incorrect:
B . 'none' : 'block'
This would hide matching accounts and show non-matching accounts, which is the opposite of the requirement.
C . 'hidden' : 'visible'
These are not valid values for the display property; they belong to the visibility property (visibility: 'hidden' | 'visible'), not display.
D . 'visible' : 'hidden'
Same issue as C: not valid for display, and reversed logic compared to requirement.
Thus, to correctly show matching accounts and hide non-matching ones, the ternary must be:
'block' : 'none'
Reference of JavaScript knowledge documents or Study Guide (concept names only):
Conditional (ternary) operator condition ? exprIfTrue : exprIfFalse
String.prototype.includes for substring checks
DOM APIs: document.querySelectorAll and forEach on NodeLists
Element styling via element.style.display
CSS display property: block vs none
________________________________________


NEW QUESTION # 16
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; } What is the output when executing the code above?

Answer: C

Explanation:
Comprehensive and Detailed
Assuming SaleItem inherits from Item via prototype (e.g. SaleItem.prototype = Object.create(Item.prototype)):
Lines 01-02: create regItem and saleItem.
Line 03: define Item.prototype.description.
Now both regItem and saleItem (via inheritance) have a description method from Item.prototype.
Line 04: regItem.description() → 'This is a Scarf'.
Line 05: saleItem.description() → 'This is a Shirt' (same method, but this.name is 'Shirt').
Line 07: SaleItem.prototype.description = ... overrides description only for SaleItem instances going forward.
If we imagine calling regItem.description() and saleItem.description() again after line 07:
regItem.description() still uses Item.prototype.description → 'This is a Scarf'.
saleItem.description() now uses SaleItem.prototype.description → 'This is a discounted Shirt'.
Those four lines correspond to option B.
________________________________________


NEW QUESTION # 17
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; } What is the output when executing the code above?

Answer: C

Explanation:
Comprehensive and Detailed
Assuming SaleItem inherits from Item via prototype (e.g. SaleItem.prototype = Object.create(Item.prototype)):
Lines 01-02: create regItem and saleItem.
Line 03: define Item.prototype.description.
Now both regItem and saleItem (via inheritance) have a description method from Item.prototype.
Line 04: regItem.description() → 'This is a Scarf'.
Line 05: saleItem.description() → 'This is a Shirt' (same method, but this.name is 'Shirt').
Line 07: SaleItem.prototype.description = ... overrides description only for SaleItem instances going forward.
If we imagine calling regItem.description() and saleItem.description() again after line 07:
regItem.description() still uses Item.prototype.description → 'This is a Scarf'.
saleItem.description() now uses SaleItem.prototype.description → 'This is a discounted Shirt'.
Those four lines correspond to option B.


NEW QUESTION # 18
Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

Answer: B


NEW QUESTION # 19
......

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