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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Salesforce Platform Integration	- Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage
Topic 2: Browser and DOM Interaction	- DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers)
Topic 3: JavaScript Language Fundamentals	- Functions, scope, and closures - Data types, variables, and operators - ES6+ syntax and features
Topic 4: Asynchronous JavaScript	- Error handling in async workflows - Promises and async/await - Event loop and concurrency model
Topic 5: Testing and Debugging	- Debugging techniques and tools - Unit testing principles

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q70-Q75):

NEW QUESTION # 70
Refer to the code below:
01 const myFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?

A. Returns 5 # (Text here appears to be a typo; correct value is 10, see explanation.)
B. Returns NaN
C. Returns 0
D. Throws an error

Answer: A

Explanation:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) = > {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
* Signature: array.reduce(callback, initialValue)
* If initialValue is provided and the array is empty , reduce:
* Does not call the callback at all.
* Simply returns initialValue.
Here:
* arr is [] (empty).
* initialValue is 10.
So:
* No iterations of the callback happen (no elements to process).
* The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
* A: 0 - incorrect, because the initial value is 10, not 0.
* B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
* C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
* D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10 . The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
The answer: D
Study Guide / Concept References (no links):
* Array.prototype.reduce behavior with initialValue
* Behavior of reduce on an empty array with and without initialValue
* Return value when no iterations run

NEW QUESTION # 71
Refer to the code below:

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

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

Answer: D

NEW QUESTION # 72
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers

A. str, substring(1,5) ;
B. str, substr(0,5) ;
C. str, substring (0,5) ;
D. str, substr(1,5) ;

Answer: B,C

NEW QUESTION # 73
JavaScript:
01 function Tiger() {
02 this.type = ' Cat ' ;
03 this.size = ' large ' ;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' They\ ' re great! ' );
09 };
10
11 function Lion() {
12 this.type = ' Cat ' ;
13 this.size = ' large ' ;
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?

A. leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
B. Object.assign(leo, Tiger);
C. Object.assign(leo, tony);
D. leo.prototype.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };

Answer: A,C

Explanation:
There are two valid ways to ensure leo.roar() exists:
* Directly assign a roar function to leo (Option A). Assigning a property to an instance object creates a new method on that instance.
* leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
After this, calling leo.roar() is valid.
* Copy tony's properties into leo using Object.assign (Option B). Object.assign(target, source) copies enumerable own properties from the source object into the target object. Since tony.roar exists, executing:
* Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
* Option C: Object.assign(leo, Tiger) copies properties from the function object Tiger , not from Tiger.
prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
* Option D: leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
JavaScript Knowledge References (text-only)
* Instances have their own properties and do not contain a .prototype property.
* Object.assign(target, source) copies own enumerable properties of the source object.
* Assigning a function as a property of an object creates a callable method.

NEW QUESTION # 74
A test has a dependency on database .query. During the test the dependency is replace with an called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?

A. Black box
B. Mocking
C. White box
D. Integration

Answer: C,D

NEW QUESTION # 75
......

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