developer wants to use a module named universalContainersLib and them call functions from it.How should a developer import every function from the module and then call the fuctions foo and bar ?

import * ad lib from '/path/universalContainersLib.js'; lib.foo(); lib.bar();

import (foo, bar) from '/path/universalContainersLib.js'; foo(); bar();

import all from '/path/universalContaineraLib.js'; universalContainersLib.foo(); universalContainersLib.bar();

import * from '/path/universalContaineraLib.js'; universalContainersLib.foo(); universalContainersLib.bar();

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?

const server =require('secure-server');

Refer to the code below?Let searchString = ' look for this ';Which two options remove the whitespace from the beginning of searchString?Choose 2 answers

searchString.replace(/*\s\s*/, '');

Which three actions can be using the JavaScript browser console?Choose 3 answers:

Run code that is not related to page.

view , change, and debug the JavaScript code of the page.

Display a report showing the performance of a page.

Run code that is not related to page.

view , change, and debug the JavaScript code of the page.

View and change security cookies.

In which situation should a developer include a try .. catch block around their function call ?

The function might raise a runtime error that needs to be handled.

The function has an error that should not be silenced.

The function results in an out of memory issue.

The function might raise a runtime error that needs to be handled.

The function contains scheduled code.

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) {

This is a ScarfUncaught TypeError: saleItem.description is not a functionThis is aScarfThis is a discounted Shirt

.//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 ?

This is a ScarfUncaught TypeError: saleItem.description is not a functionThis is aScarfThis is a discounted Shirt

This is a ScarfThis is a ShirtThis is a ScarfThis is a discounted Shirt

This is a ScarfThis is a ShirtThis is a discounted ScarfThis is a discounted Shirt

This is aScarfUncaught TypeError: saleItem.description is not a functionThis is a ShirtThis is a did counted Shirt

Refer to the following code:01 function Tiger(){02 this.Type = 'Cat';03 this.size = 'large';04 }0506 let tony = new Tiger();07 tony.roar = () =>{08 console.log('They\'re great1');09 };1011 function Lion(){12 this.type = 'Cat';13 this.size = 'large';14 }1516 let leo = new Lion();17 //Insert code here18 leo.roar();Which two statements could be inserted at line 17 to enable the function call on line 18?Choose 2 answers.

Leo.roar = () => { console.log('They\'re pretty good:'); };

Leo.prototype.roar = () => { console.log('They\'re pretty good:'); };

Which statement accurately describes an aspect of promises?

Arguments for the callback function passed to .then() are optional.

In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.

.then() cannot be added after a catch.

.then() manipulates and returns the original promise.

Given the code below:Function myFunction(){A =5;Var b =1;} myFunction();console.log(a);console.log(b);What is the expected output?

Line 08 outputs the variable, but line 09 throws an error.

Both lines 08 and 09 are executed, and the variables are outputted.

Line 08 outputs the variable, but line 09 throws an error.

Line 08 thrones an error, therefore line 09 is never executed.

Both lines 08 and 09 are executed, but values outputted are undefined.

Refer to the code below:Refer to the code below:Function Person(firstName, lastName, eyecolor) {this.firstName =firstName;this.lastName = lastName;this.eyeColor = eyeColor;}Person.job = 'Developer';const myFather = new Person('John', 'Doe');console.log(myFather.job);What is the output after the code executes?

ReferenceError: eyeColor is not defined

ReferenceError: assignment to undeclared variable "Person"

A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript TO ensure that visitors have a good experience, a script named personaliseContext needs to be executed when the webpage is fully loaded (HTML content and all related files ), in order to do some custom initialization.Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

window.addEventListener('load',personalizeWebsiteContext);

document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);

window.addEventListener('load',personalizeWebsiteContext);

window.addEventListener('onload', personalizeWebsiteContext);

Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);

Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below: All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

Use the DOM inspector to remove all the elements containing the class ad-library-item.

Use the DOM inspector to prevent the load event to be fired.

Use the browser to execute a script that removes all the element containing the class ad-libraryitem.

Use the DOM inspector to remove all the elements containing the class ad-library-item.

Use the browser console to execute a script that prevents the load event to be fired.

Which code statement correctly retrieves and returns an object from localStorage?

const retrieveFromLocalStorage = (storageKey) =>{return JSON.parse(window.localStorage.getItem(storageKey));}

const retrieveFromLocalStorage = () =>{return JSON.stringify(window.localStorage.getItem(storageKey));}

const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}

const retrieveFromLocalStorage = (storageKey) =>{return JSON.parse(window.localStorage.getItem(storageKey));}

const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}

is below:<input type="file" onchange="previewFile()"><img src="" height="200" alt="Image Preview…"/>The JavaScript portion is:01 function previewFile(){02 const preview = document.querySelector('img');03 const file = document.querySelector('input[type=file]').files[0];04 //line 4 code05 reader.addEventListener("load", () => {06 preview.src = reader.result;07 },false);08 //line 8 code09 }In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

04 const reader = new FileReader();08 if (file) reader.readAsDataURL(file);

04 const reader = new File();08 if (file) URL.createObjectURL(file);

04 const reader = new FileReader();08 if (file) URL.createObjectURL(file);

04 const reader = new File();08 if (file) reader.readAsDataURL(file);

04 const reader = new FileReader();08 if (file) reader.readAsDataURL(file);

A developer wrote the following code:01 let X = object.value;0203 try {04 handleObjectValue(X);05 } catch (error) {06 handleError(error);07 }The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.How can the developer change the code to ensure this behavior?

03 try {04 handleObjectValue(x)05 ……………………

03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 } then {08 getNextValue();09 }

03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 } finally {08 getNextValue();10 }

03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 }08 getNextValue();

03 try {04 handleObjectValue(x)05 ……………………

Refer to the following code:Let sampleText = 'The quick brown fox jumps';A developer needs to determine if a certain substring is part of a string.Which three expressions return true for the given substring ?Choose 3 answers

sampleText.includes(' quick ', 4);

sampleText.includes(' quick ') !== -1;

sampleText.includes(' quick ', 4);

sampleText.includes(' Fox ', 3)

sampleText.includes(' quick ') !== -1;

Given two expressions var1 and var2. What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean ?Choose 2 answers:

var1.toBoolean() && var2toBoolean()

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 of the properties and methods of the Item class but will also have properties that are specific to clothes.Which line of code properly declares the clothingItem class such that it inherits from Item?

Class ClothingItem extends Item {

Class ClothingItem implements Item{

Class ClothingItem super Item {

Class ClothingItem extends Item {

Refer to the code below: Line 05 causes an error.What are the values of greeting and salutation once code completes?

Greeting is Hello and salutation is Hello, Hello.

Greeting is Goodbye and salutation is Hello, Hello.

Greeting is Goodbye and salutation is I say Hello.

Greeting is Hello and salutation is I say hello.

Refer to the code below:Let str = 'javascript';Str[0] = 'J';Str[4] = 'S';After changing the string index values, the value of str is 'javascript'. What is the reason for this value:

Primitive values are immutable.

Non-primitive values are mutable.

Non-primitive values are immutable.

Primitive values are immutable.

A developer wants to create an object from a function in the browser using the code below:Function Monster() { this.name = 'hello' };Const z = Monster();What happens due to lack of the new keyword on line 02?

Window.name is assigned to 'hello' and the variable z remains undefined.

The z variable is assigned the correct object.

The z variable is assigned the correct object but this.name remains undefined.

Window.name is assigned to 'hello' and the variable z remains undefined.

Window.m is assigned the correct object.

Which two code snippets show working examples of a recursive function?Choose 2 answers

Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};

Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar * factorial ( numVar - 1 );};

Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};

Function factorial ( numVar ) {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar -1;

Const sumToTen = numVar => {If (numVar < 0)Return;return sumToTen(numVar + 1)};

Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar * factorial ( numVar - 1 );};

Refer to the HTML below:<div id="main"><ul><li>Leo</li><li>Tony</li><li>Tiger</li></ul></div>Which JavaScript statement results in changing " Tony" to "Mr. T."?

document.querySelector('$main li:nth-child(2)'),innerHTML = ' Mr. T. ';

document.querySelectorAll('$main ONY').innerHTML = ' Mr. T. ';

document.querySelector('$main li:second-child').innerHTML = ' Mr. T. ';

document.querySelector('$main li.Tony').innerHTML = ' Mr. T. ';

document.querySelector('$main li:nth-child(2)'),innerHTML = ' Mr. T. ';

Salesforce Certified JavaScript Developer I Practice Test 2

GIven a value, which three options can a developer use to detect if the value is NaN?

Choose 3 answers !

A.

value == NaN

B.

Object.is(value, NaN)

C.

value === Number.NaN

D.

value ! == value

E.

Number.isNaN(value)

Salesforce Certified JavaScript Developer I Practice Test 2

Question

Salesforce Certified JavaScript Developer I Practice Tests

Practice Tests