JavaScript-Developer-I Actual Questions & JavaScript-Developer-I Valid Dumps Pdf

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

>> JavaScript-Developer-I Actual Questions <<

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q134-Q139):

NEW QUESTION # 134
Given the code:
const copy = JSON.stringify([new String( ' false ' ), new Boolean(false), undefined]); What is the value of copy?

A. ' [ " false " , false, undefined] '
B. ' [false, {}] '
C. ' [ " false " , {}] '
D. ' [ " false " , false, null] '

Answer: D

Explanation:
JSON.stringify() applies the following rules:
* String objects (new String( ' false ' )) Are converted to their primitive string values . So:
* new String( " false " ) # " false "
* Boolean objects (new Boolean(false)) Convert to their primitive boolean value :
* new Boolean(false) # false
* Undefined values inside arrays According to the JSON specification, undefined becomes null when stringifying an array:
* JSON.stringify([undefined]) # " [null] "
Therefore, the array becomes:
[ " false " , false, null]
And JSON.stringify wraps it in quotes:
' [ " false " , false, null] '
This is exactly option A.
JavaScript Knowledge References (text-only)
* Object wrappers (String, Boolean) are converted to primitives during JSON serialization.
* undefined becomes null inside arrays when stringified.
* JSON.stringify() follows the JSON data-model rules strictly.

NEW QUESTION # 135
Refer to the code below:
Let inArray - [ [1, 2] , [3, 4, 5] ];
Which two statements result in the array [1, 2, 3, 4, 5 ]?

A. [ ] . concat. Apply ( [ ], inArray) ;
B. [ ] . concat. ( ... inArray) ;
C. [ ] . concat. Apply (inArray, [ ] );
D. [ ]. Concat ( [...InArray] );

Answer: A,D

NEW QUESTION # 136
Refer to the string below.
Const str='Salesforce';
Which two statements results in the word 'Sales'?

Answer:

Explanation:
Str.substring(0,5);
Str.substr(0,5);

NEW QUESTION # 137
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console.trace()
B. console.timeStamp ()
C. console.getTime ()
D. console. timeLog ()

Answer: D

NEW QUESTION # 138
At Universal Containers, every team has its own way of copying JavaScript objects. The code Snippet shows an implementation from one team:
Function Person() {
this.firstName = "John";
this.lastName = 'Doe';
This.name =() => (
console.log('Hello $(this.firstName) $(this.firstName)');
)}
Const john = new Person ();
Const dan = JSON.parse(JSON.stringify(john));
dan.firstName ='Dan';
dan.name();
What is the Output of the code execution?

A. Hello John DOe
B. TypeError: Assignment to constant variable.
C. Hello Dan Doe
D. TypeError: dan.name is not a function

Answer: D

NEW QUESTION # 139
......

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