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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q140-Q145):

NEW QUESTION # 140
Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?

A. Double
B. Number
C. Decimal
D. Float

Answer: B

NEW QUESTION # 141
Refer to the code below:
const pi = 3.1415926;
What is the data type of pi?

A. Double
B. Number
C. Decimal
D. Float

Answer: B

Explanation:
In JavaScript, there is only one numeric type for ordinary numbers: number.
* JavaScript number is a double-precision 64-bit binary format (IEEE 754).
* There is no separate float, double, or decimal type in core JavaScript.
So:
typeof pi === ' number ' ;
Hence, the correct answer is:
* A. Number
Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.
Study Guide Concepts:
* JavaScript primitive types
* typeof operator and number
* Lack of separate float / double / decimal types in JS

NEW QUESTION # 142
Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.

A. Let x= arr.filter((a) => ( return a>2 ));
B. Let x= arr.slice(2);
C. Let x = arr.slice(2,3);
D. Let x= arr.splice(2,3);
E. Let x= arr.filter (( a) => (a<2));

Answer: A,B,D

NEW QUESTION # 143
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?

A. setInterval(isDeg, 60000, ' cat ' );
B. setTimeout(isDeg, 60000, ' cat ' );
C. setInterval(isDeg( ' cat ' ), 60000);
D. setTimeout(isDeg( ' cat ' ), 60000);

Answer: A

Explanation:
* setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
* To call isDeg every 60 seconds with " cat " :
setInterval(isDeg, 60000, ' cat ' );
Why others are wrong:
* A/D: isDeg( ' cat ' ) is called immediately, and its return value is scheduled, not the function.
* C: setTimeout runs once after 60 seconds, not repeatedly.

NEW QUESTION # 144
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. try{
ws.connect (( ) => {
console.log('connected to client'); });
B. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
C. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
D. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});

Answer: B

Explanation:
} catch(error) { console.log('ERROR' , error); };
}

NEW QUESTION # 145
......

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Free PDF Quiz 2026 Salesforce JavaScript-Developer-I Marvelous 100% Exam Coverage

Wiki Article

JavaScript-Developer-I Book Pdf, JavaScript-Developer-I Valid Exam Answers

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q140-Q145):

Free PDF Quiz 2026 Salesforce Pass-Sure JavaScript-Developer-I: Salesforce Certified JavaScript Developer (JS-Dev-101) 100% Exam Coverage

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