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:

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?

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.”?

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?

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?

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 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?

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 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 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?

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 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?

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?

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 . . .

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?

Given the code below:

const copy = JSON.stringify([ new String(‘ false ’), new Bollean( false ), undefined ]);

What is the value of copy?