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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
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	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 4	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 5	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 6	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 (Q114-Q119):

NEW QUESTION # 114
A class was written to represent regular items and sale items. Code:
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; }
08 console.log(regItem.description());
09 console.log(saleItem.description());
What is the output?

A. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
B. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt
C. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Scarf
This is a discounted Shirt
D. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a discounted Shirt

Answer: A

Explanation:
At line 03, the developer assigns:
Item.prototype.description = function() { return 'This is a ' + this.name; } This affects all objects whose prototype chain includes Item.prototype.
regItem inherits from Item → gets this method.
saleItem, as an instance of SaleItem, also inherits Item.prototype (since SaleItem uses prototype inheritance from Item), so it also has this method at this moment.
Outputs at lines 04 and 05:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a Shirt"
At line 07, the developer overrides the method on SaleItem.prototype:
SaleItem.prototype.description = function() {
return 'This is a discounted ' + this.name;
}
From this point:
regItem still uses the Item.prototype version
saleItem uses the overridden SaleItem.prototype version
Outputs at lines 08 and 09:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a discounted Shirt"
Combining all results:
This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
This matches option B.
JavaScript Knowledge Reference (text-only)
Objects created from constructor functions use prototype chaining.
Overriding a subclass prototype method does not affect the parent class prototype.
Instances inherit the most specific version of the method on their prototype chain.

NEW QUESTION # 115
A developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning formats, what should the new package version number be?

A. 1.1.4
B. 1.2.0
C. 1.2.3
D. 2.0.0

Answer: B

NEW QUESTION # 116
Given two expressions var1 and var2. What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean ?
Choose 2 answers:

A. var1 && var2
B. Boolean(var1 && var2)
C. Boolean(var1) && Boolean(var2)
D. var1.toBoolean() && var2toBoolean()

Answer: B,C

NEW QUESTION # 117
Refer to the code below:

Which value can a developer expect when referencing country,capital,cityString?

A. 'NaN'
B. undefined
C. 'London'
D. An error

Answer: A

NEW QUESTION # 118
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?

A. try {
countSheep();
} finally {
handleError(e);
}
B. try {
setTimeout(function() {
countSheep();
}, 1000);
} catch (e) {
handleError(e);
}
C. setTimeout(function() {
try {
countSheep();
} catch (e) {
handleError(e);
}
}, 1000);
D. try {
countSheep();
} handleError (e){
catch(e);
}

Answer: C

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 # 119
......

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