Free Salesforce Certified JavaScript Developer I Exam Javascript-Developer-I Exam Practice Test

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

• Double
• Number
• Decimal
• Float

A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.What is the correct syntax for scheduling this function?

• setInterval(isDog, 60000,'cat');
• setInterval(isDog, 50000,'cat');

developer is trying to convince management that their team will benefit from usingNode.js for a backend server that they are going to create. The server will be a web server thathandles API requests from a website that the team has already built using HTML, CSS, andJavaScript.Which three benefits of Node.js can the developer use to persuade their manager?Choose 3 answers:

• Installs with its own package manager to install and manage third-party libraries.
• Ensures stability with one major release every few years.
• Performs a static analysis on code before execution to look for runtime errors.
• Executes server-side JavaScript code to avoid learning a new language.
• Uses non-blocking functionality for performant request handling .

Refer to the code below:let sayHello = () => {console.log ('Hello, world!');};Which code executes sayHello once, two minutes from now?

• setTimeout(sayHello, 12000);
• setInterval(sayHello, 12000);
• setTimeout(sayHello(), 12000);
• delay(sayHello, 12000);

Refer to the code below:const event = new CustomEvent(//Missing Code);obj.dispatchEvent(event);A developer needs to dispatch a custom event called update to send information aboutrecordId.Which two options could a developer insert at the placeholder in line 02 to achieve this?Choose 2 answers

• 'Update' , ( recordId : '123abc' (
• 'Update' , '123abc'
• { type : 'update', recordId : '123abc' }
• 'Update' , { Details : { recordId : '123abc' } }

Refer to the code below:Let foodMenu1 = ['pizza', 'burger', 'French fries'];Let finalMenu = foodMenu1;finalMenu.push('Garlic bread');What is the value of foodMenu1 after the code executes?

• [ 'pizza','Burger', 'French fires', 'Garlic bread']
• [ 'pizza','Burger', 'French fires']
• [ 'Garlic bread' , 'pizza','Burger', 'French fires' ]
• [ 'Garlic bread']

Which two options are core Node.js modules?Choose 2 answers

• worker
• isotream
• exception
• http

Refer the code below.x=3.14;function myfunction() {'use strict';y=x;}z=x;myFunction();

• A . Explanation:
  Z is equal to 3.14
  Use strict has effect only on line 5.
  Line 5 throws an error
  

Cloud Kicks has a class to represent items for sale in an online store, as shown below:Class Item{constructor (name, price){this.name = name;this.price = price;}formattedPrice(){return 's' + String(this.price);}}A new business requirement comes in that requests a ClothingItem class that should have all ofthe properties and methods of the Item class but will also have properties that are specific toclothes.Which line of code properly declares the clothingItem class such that it inherits fromItem?

• Class ClothingItem implements Item{
• Class ClothingItem {
• Class ClothingItem super Item {
• Class ClothingItem extends Item {

A developer wants to define a function log to be used a few times on a single-file JavaScript script.01 // Line 1 replacement02 console.log(''LOG:', logInput);03 }Which two options can correctly replace line 01 and declare the function for use?Choose 2 answers

• function leg(logInput) {
• const log(loginInput) {
• const log = (logInput) => {
• function log = (logInput) {