Refer to HTML below:<p> The current status of an Order: <span id ="status"> In Progress </span> </p>.Which JavaScript statement changes the text 'In Progress' to 'Completed' ?

document.getElementById("status").innerHTML = 'Completed' ;

document.getElementById("status").Value = 'Completed' ;

document.getElementById("#status").innerHTML = 'Completed' ;

document.getElementById("status").innerHTML = 'Completed' ;

document.getElementById(".status").innerHTML = 'Completed' ;

A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:Import printPrice from '/path/PricePrettyPrint.js';Based on the code, what must be true about the printPrice function of the PricePrettyPrint module for this import to work ?

printPrice must be the default export

printPrice must be be a named export

printPrice must be an all export

printPrice must be the default export

printPrice must be a multi exportc

What are two unique features of functions defined with a fat arrow as compared to normal function definition?Choose 2 answers

The function generated its own this making it useful for separating the function's scope from its enclosing scope.

The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

The function generated its own this making it useful for separating the function's scope from its enclosing scope.

The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

If the function has a single expression in the function body, the expression will be evaluated and implicit returned.

The function uses the this from the enclosing scope.

A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.Here is the HTML file content:<input type =" text" value="Hello" name ="input"><button type ="button" >Display </button> The developer wrote the javascript code below:Const button = document.querySelector('button');button.addEvenListener('click', () => ( Const input = document.querySelector('input');console.log(input.getAttribute('value'));When the user clicks the button, the output is always "Hello".What needs to be done to make this code work as expected?

Replace line 04 with console.log(input .value);

Replace line 03 with const input = document.getElementByName('input');

Replace line 02 with button.addCallback("click", function() {

Replace line 02 with button.addEventListener("onclick", function() {

The developer wants to test this code:Const toNumber =(strOrNum) => strOrNum;Which two tests are most accurate for this code?Choose 2 answers

console.assert(toNumber('2') === 2);

console.assert(toNumber('-3') < 0);

console.assert(toNumber('2') === 2);

console.assert(Number.isNaN(toNumber()));

console.assert(toNumber('-3') < 0);

console.assert(toNumber () === NaN);

Refer to the code below:Refer to the code below:Const resolveAfterMilliseconds = (ms) => Promise.resolve (setTimeout (( => console.log(ms), ms ));Const aPromise = await resolveAfterMilliseconds(500);Const bPromise = await resolveAfterMilliseconds(500);Await aPromise, wait bPromise;What is the result of running line 05?

Neither aPromise or bPromise runs.

aPromise and bPromise run sequentially.

Neither aPromise or bPromise runs.

aPromise and bPromise run in parallel.

Why would a developer specify a package.jason as a developed forge instead of a dependency ?

It is only needed for local development and testing.

It is required by the application in production.

It is only needed for local development and testing.

Other required packages depend on it for development.

It should be bundled when the package is published.

Given the code below:Setcurrent URL ();console.log('The current URL is: ' +url );function setCurrentUrl() {Url = window.location.href:What happens when the code executes?What happens when the code executes?

The url variable has global scope and line 02 executes correctly.

The url variable has local scope and line 02 throws an error.

The url variable has global scope and line 02 executes correctly.

The url variable has global scope and line 02 throws an error.

The url variable has local scope and line 02 executes correctly.

A developer has two ways to write a function:Option A:function Monster() {This.growl = () => {Console.log ("Grr!");}}Option B:function Monster() {};Monster.prototype.growl =() => {console.log("Grr!");}After deciding on an option, the developer creates 1000 monster objects.How many growl methods are created with Option A Option B?

1000 growl method is created for Option A. 1 growl methods are created for Option B.

1 growl method is created for Option A. 1000 growl methods are created for Option B.

1000 growl method is created for Option A. 1 growl methods are created for Option B.

1000 growl methods are created regardless of which option is used.

1 growl method is created regardless of which option is used.

In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.Which two methods are used to address this ?Choose 2 answers

Assign variables to the global object.

Use the document object instead of the window object.

Assign variables to the global object.

Create a new window object in the root file.

Assign variables to module.exports and require them as needed.

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.

Let x= arr.filter((a) => ( return a>2 ));

Let x= arr.filter (( a) => (a<2));

Let x= arr.filter((a) => ( return a>2 ));

Refer to code below:Const objBook = {Title: 'Javascript',}; Object.preventExtensions(objBook);Const newObjBook = objBook;newObjectBook.author = 'Robert';What are the values of objBook and newObjBook respectively ?

[title: "javaScript"] [title: "javaScript"]

{author: "Robert", title: "javaScript}Undefined

{author: "Robert", title: "javaScript}{author: "Robert", title: "javaScript}

{author: "Robert"}{author: "Robert", title: "javaScript}

A developer implements and calls the following code when an application state change occurs:Const onStateChange =innerPageState) => {window.history.pushState(newPageState, ' ', null);}If the back button is clicked after this method is executed, what can a developer expect?

The page is navigated away from and the previous page in the browser's history is loaded.

A navigate event is fired with a state property that details the previous application state.

The page is navigated away from and the previous page in the browser's history is loaded.

The page reloads and all Javascript is reinitialized.

A popstate event is fired with a state property that details the application's last state.

Refer to the expression below:Let x = ('1' + 2) == (6 * 2);How should this expression be modified to ensure that evaluates to false?

Let x = ('1' + ' 2') == ( 6 * 2);

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

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

import * from '/path/universalContainersLib.js'; universalContainersLib. foo ()7 universalContainersLib.bar ();

import {foo,bar} from '/path/universalCcontainersLib.js'; foo(): bar()?

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

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

Which two console logs output NaN?Choose 2 answers | |

console.log(10 / Number('5) ) ;

console.log(parseInt ' ("two')) ;

console.log(10 / Number('5) ) ;

console.log(parseInt ' ("two')) ;

A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the function to run once after five seconds.What is the correct syntax to schedule this function?

setTimeout ('formatName', 5000, 'John", "Doe');

setTimeout (formatName(), 5000, "John", "BDoe");

setTimeout (formatName('John', ''Doe'), 5000);

setTimout(() => { formatName("John', 'Doe') }, 5000);

setTimeout ('formatName', 5000, 'John", "Doe');

A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.Which command can the web developer run to see what the module is doing during the latency period?

DEBUG=http, https node server.js

NODE_DEBUG=http,https node server.js

myArraym can have one level, two levels, or more levels.Which statement flattens myArray when it can be arbitrarily nested?

myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

myArray. join (","). split (",");

Salesforce Certified JavaScript Developer I Practice Test 4

Question 1 / 40

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?

ws.connect (( ) => { console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};

ws.on ('connect', ( ) => { console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });});

ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

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

Comment (0)

Salesforce Certified JavaScript Developer I Practice Test 4

Question

Salesforce Certified JavaScript Developer I Practice Tests

Practice Tests