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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2	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 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
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.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q146-Q151):

NEW QUESTION # 146
Given the expressionsvar1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

A. var1 + var2
B. var1.toString ( ) var2.toString ( )
C. String (var1) .concat (var2)
D. string.concat (var1 +var2)

Answer: B,D

NEW QUESTION # 147
Given the code below:
Which three code segments result in a correct conversion from number to string? Choose 3 answers

A. let strValue = numValue.toText ();
B. let strValue = (String)numValue;
C. let strValue = * * 4 numValue;
D. let strValue = numValue. toString();
E. let scrValue = String(numValue);

Answer: C,D,E

NEW QUESTION # 148
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information thedeveloper has, which code logs an error at boost with an event?

A. Server.catch ((server) => {console.log('ERROR', error);});
B. Server.on ('error', (error) => {console.log('ERROR', error);});
C. Try{server.start();} catch(error) {console.log('ERROR', error);}
D. Server.error ((server) => {console.log('ERROR', error);});

Answer: B

NEW QUESTION # 149
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
Uncaught TypeError: saleItem.description is not a function
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 Shirt
This is a discounted Shirt
D. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt

Answer: D

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge 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 # 150
A developer implements a function that adds a few values.
```javascript
function sum(num1, num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num1 + num2 + num3;
}
```
Which three options can the developer invoke for this function to get a return value of 10?
Choose 3 answers

A. sum(10,();
B. sum()(10);
C. sum(5)(5);
D. sum()(5)(5);
E. sum(5,5,)();

Answer: B,C

NEW QUESTION # 151
......

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