A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:function calculateBill ( items ) {let total = 0;total += findSubTotal(items);total += addTax(total);total += addTip(total);return total;}Which option allows the developer to step into each function execution within calculateBill?

Using the debugger command on line 05.

Using the debugger command on line 03

Calling the console.trace (total) method on line 03.

Wrapping findSubtotal in a console.log() method.

The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".What can the developer do to change the code to print "Hello World" ?

Change line 2 to console.log('Hello' , name() );

Change line 9 to sayHello(world) ();

Change line 5 to function world ( ) {

A developer has the function, shown below, that is called when a page loads.function onload() {console.log("Page has loaded!");}Where can the developer see the log statement after loading the page in the browser?

Terminal running the web server.

What is the result of the code block?

The console logs 'flag' and then an error is thrown.

The console logs 'flag' and another flag.

The console logs 'flag' and then an error is thrown.

Refer to the following code that imports a module named utils:import (foo, bar) from '/path/Utils.js';foo() ;bar() ;Which two implementations of Utils.js export foo and bar such that the code above runs without error?Choose 2 answers

const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }

Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}

// FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from ' /path/NarUtils.js';

const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }

Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}

const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;

developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.Given the code and the information the developer has, which code logs an error at boost with an event?

Server.on ('error', (error) => {console.log('ERROR', error);});

Server.catch ((server) => {console.log('ERROR', error);});

Server.error ((server) => {console.log('ERROR', error);});

Server.on ('error', (error) => {console.log('ERROR', error);});

Try{server.start();} catch(error) {console.log('ERROR', error);}

Which code statement below correctly persists an objects in local Storage ?

const setLocalStorage = (storageKey, jsObject) => {window.localStorage.setItem(storageKey, JSON.stringify(jsObject));}

const setLocalStorage = ( jsObject) => {window.localStorage.connectObject(jsObject));}

const setLocalStorage = ( jsObject) => {window.localStorage.setItem(jsObject);}

const setLocalStorage = (storageKey, jsObject) => {window.localStorage.persist(storageKey, jsObject);}

Given the code below: const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]); What is the value of copy?

-- [ \"false\" ,false, null ]--

-- [ \"false\" , false, undefined ]--

-- [ \"false\" ,false, null ]--

The developer wants to test the array shown: const arr = Array(5).fill(0) Which two tests are the most accurate for this array ?Choose 2 answers:

console.assert( arr.length === 5 );

arr.forEach(elem => console.assert(elem === 0)) ;

console.assert( arr.length === 5 );

arr.forEach(elem => console.assert(elem === 0)) ;

console.assert(arr[0] === 0 && arr[ arr.length] === 0);

console.assert (arr.length >0);

Given the following code:document.body.addEventListener(' click ', (event) => {if (/* CODE REPLACEMENT HERE */) {console.log('button clicked!');)});Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

event.target.nodeName == 'BUTTON'

button.addEventListener('click')

Given the following code:document.body.addEventListener(' click ', (event) => {if (/* CODE REPLACEMENT HERE */) {console.log('button clicked!');)});Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

event.target.nodeName == 'BUTTON'

button.addEventListener('click')

Refer to HTML below:<div id ="main"><div id = " card-00">This card is smaller.</div><div id = "card-01">The width and height of this card is determined by its contents.</div></div> Which expression outputs the screen width of the element with the ID card-01?

document.getElementById(' card-01 ').getBoundingClientRest().width

document.getElementById(' card-01 ').style.width

document.getElementById(' card-01 ').width

document.getElementById(' card-01 ').innerHTML.lenght*e

developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.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.

Performs a static analysis on code before execution to look for runtime errors.

Uses non-blocking functionality for performant request handling .

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 .

A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?Which two promises are rejected?Which 2 are correct?

Promise.reject('cool error here').catch(error => console.error(error));

New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;

Promise.reject('cool error here').then(error => console.error(error));

Promise.reject('cool error here').catch(error => console.error(error));

New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;

New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));

Refer to code below:function Person() {this.firstName = 'John';}Person.prototype ={Job: x => 'Developer'};const myFather = new Person();const result =myFather.firstName + ' ' + myFather.job();What is the value of the result after line 10 executes?

Error: myFather.job is not a function

Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.• Address this problem, UC decides to implement a debounce function on string change handler.What are three key steps to implement this debounce function?Choose 3 answers:

If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.

When the search string changes, enqueue the request within a setTimeout.

Ensure that the network request has the property debounce set to true.

If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.

When the search string changes, enqueue the request within a setTimeout.

Ensure that the network request has the property debounce set to true.

If there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timerId and replace it with a new setTimeout.

Store the timeId of the setTimeout last enqueued by the search string change handle.

Which option is true about the strict mode in imported modules?

You can only reference notStrict() functions from the imported module.

Add the statement use non-strict, before any other statements in the module to enable not-strict mode.

You can only reference notStrict() functions from the imported module.

Imported modules are in strict mode whether you declare them as such or not.

Add the statement use strict =false; before any other statements in the module to enable not- strict mode.

Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.UC is thinking about reusability and how each team can benefit from the work of others.Going open-source or public is not an option at this time.Which option is available to UC with npm?

Private packages can be scored, and scopes can be associated to a private registries.

Private registries are not supported by npm, but packages can be installed via URL.

Private packages are not supported, but they can use another package manager like yarn.

Private registries are not supported by npm, but packages can be installed via git.

Refer to code below:Let first = 'who';Let second = 'what';Try{Try{Throw new error('Sad trombone');}catch (err){First ='Why';}finally {Second ='when';} catch (err) {Second ='Where';}What are the values for first and second once the code executes ?

First is why and second is when

First is Who and second is When

First is why and second is where

First is who and second is where

First is why and second is when

Which javascript methods can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?

JSON.serialize and JSON.deserialize

JSON.parse and JSON.deserialize

Refer to the code below:<html lang="en"><table onclick="console.log(Table log');"><tr id="row1"><td>Click me!</td></tr><table><script> function printMessage(event) { console.log('Row log');}Let elem = document.getElementById('row1'); elem.addEventListener('click', printMessage, false);</script></html>Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?

Add event.stopPropagation(); to printMessage function.

Add.event.stopPropagation(); to window.onLoad event handler.

Add event.stopPropagation(); to printMessage function.

Add event.removeEventListener(); to window.onLoad event handler.

Add event.removeEventListener(); toprintMessage function.

Refer to code below:Let a ='a';Let b;// b = a; console.log(b);What is displayed when the code executes?

ReferenceError: b is not defined

Refer to the code below:Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];Which two statements result in the array [1, 2, 3, 4, 5] ?Choose 2 answers

[ ]. Concat.apply ([ ], inArray);

[ ]. concat.apply(inArray, [ ]);

[ ]. concat ( [ ….inArray ] );

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 turn around 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

NODE_DEBUG =true node server.js

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']

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

[ 'pizza','Burger', 'French fires']

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

Refer to code below:Let productSKU = '8675309' ;A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with 'sku', and padded with zeros.Which statement assigns the values sku0000000008675309 ?

productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');

productSKU = productSKU .padStart (19. '0').padstart('sku');

productSKU = productSKU .padEnd (16. '0').padstart('sku');

productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');

productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');

Salesforce Certified JavaScript Developer I Practice Test 3

Question 1 / 40

A developer wrote a fizzbuzz function that when passed in a number, returns the following:

• 'Fizz' if the number is divisible by 3.

• 'Buzz' if the number is divisible by 5.

• 'Fizzbuzz' if the number is divisible by both 3 and 5.

• Empty string if the number is divisible by neither 3 or 5.

Which two test cases will properly test scenarios for the fizzbuzz function?

Choose 2 answers

let res = fizzbuzz(5); console.assert ( res === ' ' );

let res = fizzbuzz(15); console.assert ( res === ' fizzbuzz ' )

let res = fizzbuzz(Infinity); console.assert ( res === ' ' )

let res = fizzbuzz(3); console.assert ( res === ' buzz ' )

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Salesforce Certified JavaScript Developer I Practice Test 3

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Salesforce Certified JavaScript Developer I Practice Tests

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