Free JAVASCRIPT-DEVELOPER-I Exam Dumps Preview

A developer is debugging a web server that uses Node.js The server hits a runtime error every third request to an important endpoint on the web server.

The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.

Which command can be run to access DevTools and make sure the breakdown is hit?

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

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:

A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.

Which global variable can be used in the script?

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.

Refer to the code below:

Let car1 = new Promise((_ , reject) =>

setTimeout(reject, 2000, "car 1 crashed in" =>

Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed")

Let car3 =new Promise(resolve =>setTimeout(resolve, 3000, "car 3 completed")

Promise.race(( car1, car2, car3))

.then (value => (

Let result = `$(value) the race.';)}

.catch(arr => {

console.log("Race is cancelled.", err);

});

What is the value of result when Promise.race executes?

Refer to the code below:

What is the result when the Promise in the execute function is rejected?

Referto the code below:

Const pi = 3.1415326,

What is the data type of pi?

CORRECT TEXT

Refer the following code

what is the value of array after code executes?

There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

Given the following code:

What is the output of line 02?

Given the code below:

Function myFunction(){

A =5;

Var b =1;
}

myFunction();

console.log(a);

console.log(b);

What is the expected output?

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

Which statement accurately describes an aspect of promises?

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 below:

Let textValue = '1984';

Which code assignment shows a correct way to convert this string to an integer?

A developer wrote a fizzbuzzfunction 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 neither3 or 5.

Which two test cases will properly test scenarios for the fizzbuzz function? Choose 2 answers

A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.

Which two test approaches describe the requirement? Choose 2 answers

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?

Which option is a core Node,js module?

Refer to the following code:

01 function Tiger(){

02 this.Type = `Cat';

03 this.size = `large';

04 }

06 let tony = new Tiger();

07 tony.roar = () =>{

08 console.log(`They\'re great1');

09 };

11 function Lion(){

12 this.type = `Cat';

13 this.size = `large';

14 }

16 let leo = new Lion();

17//Insert code here

18 leo.roar();

Which two statements could be inserted at line 17 to enable the function call on line 18? Choose 2 answers.

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

Refer to code below:

Let a ='a';

Let b;

// b = a;

console.log(b);

What is displayed when the code executes?

A developer wants to set up a secure web serverwith 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?

A developer needs to test this function:

01const sum3 = (arr) => (

02if (!arr.length) return 0,

03if (arr.length === 1) return arr[0],

04if (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 initiates a server with the file server,js and adds dependencies in the source codes package,json that are required to run the server.

Which command should the developer run to start the server locally?

A developer has an is Dog function that takes one argument cat. They want to schedule the function to run everyminute.

What is the correct syntax for scheduling this function?

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?

Refer of the string below:

Const str = `sa;esforce'=;

Which two statement result in the word 'Sale'? Choose 2 answers

Given the code below:

What is logged to the console?

Refer to HTML below:

<p> The current status of an Order: <span id ="status"> In Progress </span> </p>.

Which JavaScript statement changes thetext `In Progress' to `Completed' ?

A developer is required to write a function that calculates the sum of elements in an array but is getting undefinedevery 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?

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?

At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?