Salesforce JavaScript Developer I

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:

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

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 about recordId. Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers

At Universal Containers, every team has its own way of copying JavaScript objects. The code Snippet shows an implementation from one team: Function Person() { this.firstName = “John”; this.lastName = ‘Doe’; This.name =() => ( console.log(‘Hello $(this.firstName) $(this.firstName)’); )} Const john = new Person (); Const dan = JSON.parse(JSON.stringify(john)); dan.firstName =’Dan’; dan.name(); What is the Output of the code execution?

Refer to the code below: catch( arr => ( 10 console.log(“Race is cancelled.”, err); 11 )); What is the value of result when Promise.race executes?

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

Refer to the following code: function test (val) { If (val === undefined) { return ‘Undefined values!’ ; } if (val === null) { return ‘Null value! ’; } return val; } Let x; test(x); What is returned by the function call on line 13?

CORRECT TEXT Given the requirement to refactor the code above to JavaScript class format, which class definition is correct? A) B) C) D)

Refer to the code below: Async funct on functionUnderTest(isOK) { If (isOK) return ‘OK’ ; Throw new Error(‘not OK’); ) Which assertion accuretely tests the above code?

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

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.”?

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:

Refer to the code snippet below: Let array = [1, 2, 3, 4, 4, 5, 4, 4]; For (let i =0; i < array.length; i++) if (array[i] === 4) { array.splice(i, 1); } } What is the value of array after the code executes?

Given code below: setTimeout (() => ( console.log(1); ). 0); console.log(2); New Promise ((resolve, reject )) = > ( setTimeout(() => ( reject(console.log(3)); ). 1000); )).catch(() => ( console.log(4); )); console.log(5); What is logged to the console?

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:

Refer to the code below: console.log(‘’start); Promise.resolve(‘Success’) .then(function(value){ console.log(‘Success’); }); console.log(‘End’); What is the output after the code executes successfully?

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

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?

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?

Refer to the following code that performs a basic mathematical operation on a provided input: function calculate(num) { Return (num +10) / 3; } How should line 02 be written to ensure that x evaluates to 6 in the line below? Let x = calculate (8);

A developer wrote the following code: 01 let X = object.value; 02 03 try { 4 handleObjectValue(X); 5 } catch (error) { 6 handleError(error); 7 } 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?

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

A developer uses a parsed JSON string to work with user information as in the block below: 01 const userInformation ={ 02 “ id ” : “user-01”, 03 “email” : “user01@universalcontainers.demo”, 04 “age” : 25 Which two options access the email attribute in the object? Choose 2 answers

Given the following code: Counter = 0; const logCounter = () => { console.log(counter); ); logCounter(); setTimeout(logCOunter, 1100); setInterval(() => { Counter++ logCounter(); }, 1000); What is logged by the first four log statements?

developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3. Following semantic versioning format, what should the new package version number be?

A developer has an ErrorHandler module that contains multiple functions. What kind of export be leverages so that multiple functions can be used?

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

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?

A developer writers the code below to calculate the factorial of a given number. Function factorial(number) { Return number + factorial(number -1); } factorial(3); What is the result of executing line 04?

Refer to the following code: 01 function Tiger(){ 02 this.Type = ‘Cat’; 03 this.size = ‘large’; 04 } 05 06 let tony = new Tiger(); 07 tony.roar = () =>{ 08 console.log(‘They’re great1’); 9 }; 10 11 function Lion(){ 12 this.type = ‘Cat’; 13 this.size = ‘large’; 14 } 15 16 let leo = new Lion(); 17 //Insert code here 18 leo.roar();

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?

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 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?

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?

A developer removes the HTML class attribute from the checkout button, so now it is simply: <button>Checkout</button>. There is a test to verify the existence of the checkout button, however it looks for a button with class= “blue”. The test fails because no such button is found. Which type of test category describes this test?

A developer creates an object where its properties should be immutable and prevent properties from being added or modified. Which method should be used to execute this business requirement?

Refer to the code below: Const searchTest = ‘Yay! Salesforce is amazing!” ; Let result1 = searchText.search(/sales/i); Let result 21 = searchText.search(/sales/i); console.log(result1); console.log(result2); After running this code, which result is displayed on the console?

Refer to the code below: Function changeValue(obj) { Obj.value = obj.value/2; } Const objA = (value: 10); Const objB = objA; changeValue(objB); Const result = objA.value; What is the value of result after the code executes?

A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below. Const sumFunction = arr => { Return arr.reduce((result, current) => { // Result += current; // ), 10); ); Which option makes the code work as expected?

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:

Refer to the following code: Let obj ={ Foo: 1, Bar: 2 } Let output =[], for(let something in obj{ output.push(something); } console.log(output); What is the output line 11?

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

Which three statements are true about promises? Choose 3 answers

Which statement accurately describes the behaviour of the async/ await keyworks?

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?

A developer has the following array of student test grades: Let arr = [ 7, 8, 5, 8, 9 ]; The Teacher wants to double each score and then see an array of the students who scored more than 15 points. How should the developer implement the request?

A developer implements a function that adds a few values. Function sum(num) { If (num == undefined) { Num =0; } Return function( num2, num3){ If (num3 === undefined) { Num3 =0 ; } Return num + num2 + num3; } } Which three options can the developer invoke for this function to get a return value of 10? Choose 3 answers

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?

A developer needs to test this function: 01 const sum3 = (arr) => ( 02 if (!arr.length) return 0, 03 if (arr.length === 1) return arr[0], 04 if (arr.length === 2) return arr[0] + arr[1], 05 return arr[0] + arr[1] + arr[2], 06 ); Which two assert statements are valid tests for the function? Choose 2 answers

A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed. The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time. 01 function listen(event) { 02 alert ( ‘Hey! I am John Doe’) ; 03 button.addEventListener (‘click’, listen); Which two code lines make this code work as required? Choose 2 answers

Given the code below: 01 function GameConsole (name) { 02 this.name = name; 3 } 4 5 GameConsole.prototype.load = function(gamename) { 6 console.log( ` $(this.name) is loading a game : $(gamename) …`); 7 ) 8 function Console 16 Bit (name) { 9 GameConsole.call(this, name) ; 10 } 11 Console16bit.prototype = Object.create ( GameConsole.prototype) ; 12 //insert code here 13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) …`); 14 } 15 const console16bit = new Console16bit(‘ SNEGeneziz ’); 16 console16bit.load(‘ Super Nonic 3x Force ’); What should a developer insert at line 15 to output the following message using the method? > SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .

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:

Refer to the code: Given the code above, which three properties are set pet1? Choose 3 answers:

Refer to following code block: Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,]; Let output =0; For (let num of array){ if (output >0){ Break; } if(num % 2 == 0){ Continue; } Output +=num; What is the value of output after the code executes?

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?

A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time. Which two test approaches describe the requirement? Choose 2 answers

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