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New Salesforce Developer JavaScript-Developer-I Exam Practice Questions

Total 215 Questions

Last Updated On: 16-Jan-2025

Question # 1

A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js Without using any third-party libraries, what should the developer add to index.js to create the secure web server?
A. const https =require(‘https’);
B. const server =require(‘secure-server’);
C. const tls = require(‘tls’);
D. const http =require(‘http’);

const https =require(‘https’);

Question # 2

A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation. Const deliveryDate = new Date (); Due to changes in the business requirements, the delivery date must now be today’s date + 9 days. Which code meets this new requirement?
A. deliveryDate.setDate(( new Date ( )).getDate () +9);
B. deliveryDate.setDate( Date.current () + 9);
C. deliveryDate.date = new Date(+9) ;
D. deliveryDate.date = Date.current () + 9;

deliveryDate.setDate(( new Date ( )).getDate () +9);

Question # 3

Refer to code below: Let a =’a’; Let b; // b = a; console.log(b); What is displayed when the code executes?
A. ReferenceError: b is not defined
B. A
C. Undefined
D. Null

Undefined

Question # 4

A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below: Class Item { constructor(name, price) { … // Constructor Implementation } } Class SaleItem extends Item { constructor (name, price, discount) { ...//Constructor Implementation } } There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem. Let regItem =new Item(‘Scarf’, 55); Let saleItem = new SaleItem(‘Shirt’ 80, -1); Item.prototype.description = function () { return ‘This is a ’ + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return ‘This is a discounted ’ + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?
A. This is a Scarf Uncaught TypeError: saleItem.description is not a function This is aScarf This is a discounted Shirt
B. This is a Scarf This is a Shirt This is a Scarf This is a discounted Shirt
C. This is a Scarf This is a Shirt This is a discounted Scarf This is a discounted Shirt
D. This is aScarf Uncaught TypeError: saleItem.description is not a function This is a Shirt This is a did counted Shirt

This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt

Question # 5

Refer to the code below: 01 const exec = (item, delay) =>{ 02 new Promise(resolve => setTimeout( () => resolve(item), delay)), 03 async function runParallel() { 04 Const (result1, result2, result3) = await Promise.all{ 05 [exec (‘x’, ‘100’) , exec(‘y’, 500), exec(‘z’, ‘100’)] 06 ); 07 return `parallel is done: $(result1) $(result2)$(result3)`; 08 } } } Which two statements correctly execute the runParallel () function? Choose 2 answers
A. Async runParallel () .then(data);
B. runParallel ( ). done(function(data){ return data; });
C. runParallel () .then(data);
D. runParallel () .then(function(data) return data

runParallel ( ). done(function(data){
return data;
});

runParallel () .then(function(data)
return data

Question # 6

A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes. A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array Which two results occur when running this test on the updated sum3 function? Choose 2 answers
A. The line 05 assertion passes.
B. The line 02 assertion passes.
C. The line 02 assertion fails.
D. The line 05 assertion fails.

The line 02 assertion passes.

The line 05 assertion fails.

Question # 7

A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented. 01 function logStatus(status){ 02 console./Answer goes here/{‘Item status is: %s’, status}; 03 } Which three console logging methods allow the use of string substitution in line 02?
A. Assert
B. Log
C. Message
D. Info
E. ErrorA

Assert

Info

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