Latest JavaScript-Developer-I Study Guides 2022 - With Test Engine PDF
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NEW QUESTION 57
In the browser, the window object is often used to assign variables that require the broadcast scope in an application Node is application do not have access to the window object by default.
Which two methods are used to address this? Choose 2 answer
- A. Use the document instead of the window object.
- B. Assign variables to module, exports and require them as needed.
- C. Create a new window object in the root file.
- D. Assign variables to the global object.
Answer: A,C
NEW QUESTION 58
Universal containers (UC) just launched a new landing page, but users complain that the website is slow, A developer found some functions that cause this problem, To verify this, the developer decides to execute everything and log the time each of these suspicious function consumes.
Which function can then developer use to obtain the time spent by every one of the three functions?
- A. Console.getTime ( )
- B. Console.timeLog ( )
- C. Console,trace ( )
- D. Console, timestamp
Answer: A
NEW QUESTION 59
Which three statements are true about promises?
The executor of a new promise runs automatically.
- A. A fulfilled or rejected promise will not change states.
- B. A promise has a . then 90 method.
- C. A pending promise can become fulfilled, settled or rejected.
- D. A settled promises can become resolved.
Answer: A,B,D
NEW QUESTION 60
Refer to the code below:
Which statement allows a developer to cancel the scheduled timed function?
- A. removeTimeout (timerId) ;
- B. ClearTimeout (timeFunction);
- C. ClearTimeout (timerId) ;
- D. removeTimeout (timeFunction) ;
Answer: D
NEW QUESTION 61
Which three actions can be done using the JavaSript browser console?
Choose 3 answer
- A. Run code a that is not related to the page.
- B. View and change security cookies
- C. View and change the DOM of the page.
- D. View, change, and debug the JavaScript code of the page.
- E. Display a report showing the performance of a page.
Answer: A,C,D
NEW QUESTION 62
Refer to the code below:
A developer import a library that creates a web server. the imported library uses events and callback to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
- A. Server .start();
- B. server( );
- C. server ( (port) => (
Console.log ('Listening on' , port) ;
}}; - D. Server. on ('connet' , (port) => (
Console.log (Listening on' port);
}};
Answer: C
NEW QUESTION 63
A developer is leading the creating of a new browser application that will server a single page application. The team wants to use a new web framework Minialist.js. The lead developer wants to advocate for a more seasoned wen framework that already has a community around it.
Which two frameworks should the load developer advocate for?
- A. Angular
- B. Koa
- C. Vue
- D. Express
Answer: A,D
NEW QUESTION 64
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?
- A. The developer missed the option - add when adding the dependency.
- B. The developer added the dependency as a dev dependency, and NODK_ENV is set to production.
- C. The developer added the dependency as a dev dependency, and NOOK_ENV is set to production.
- D. The developer missed the option -ssve when adding the dependency.
Answer: B,C,D
NEW QUESTION 65
Refer to the code below:
What is the output after the code executes?
- A. ReferenceError: eyeColor is not defined
- B. ReferenceError: assignment to undeclared variable ''Person''
- C. undefined
- D. Developer
Answer: C
NEW QUESTION 66
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the DOM inspector to remove all the elements containing the class ad-library-item.
- B. Use the DOM inspector to prevent the load event to be fired.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the browser to execute a script that removes all the element containing the class ad-library-item.
Answer: D
NEW QUESTION 67
Given the following code:
Let x = ('15' +10) +2;
What is the value of x?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 68
Refer to the code below.
After changing the string index values, the of atr is Javascript''. What is the reason for this value?
- A. Non-primitive values are mutable.
- B. Primitive values are immutable
- C. Non-primitive values are immutable.
- D. Primitive values are mutable.
Answer: A
NEW QUESTION 69
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current dat. The code line below is responsible for this calculation.
Const deliveryDate = new Date ( );
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirements?
- A. deliveryDate. setDate (( new Date ()) .getDate () + 9);
- B. deliveryDate. setDate ( Date . current () + 9 0;
- C. deliveryDate. Date = new Date (+9) ;
- D. deliveryDate . date = date . current () + 9
Answer: A
NEW QUESTION 70
Given the HTML below:
Which statement adds the priority-account CSS class to the Unversal Containers row?
- A. Document. getElementById ( 'row-uc') addClass ( ' priority-account');
- B. Document. querySelector ( 'row-uc') . classList. Add ( 'pariority-account') ;
- C. Document. queryselector ('# row-uc') ,classes. Push (' priority-account');
- D. Document. querySelectorAll ( '# row-uc ') .classList. add ('priority-account');
Answer: B
NEW QUESTION 71
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
- A. When rejected
- B. When resolved or rejected
- C. WHen resolved
- D. When resolved and settled
Answer: B
NEW QUESTION 72
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
- A. Let x = arr. Slince (2, 3);
- B. Let x = arr.alice (2) ;
- C. Let x = arr.filter( (a) => ( a < 2)) ;
- D. Let x = arr.filter( (a) => )return a > 2 )) ;
- E. Let x = arr.aplice (2, 3);
Answer: B,D,E
NEW QUESTION 73
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?
- A. > true > false
- B. > 5 > -1
- C. > 5 > 0
- D. > 5 >undefined
Answer: D
Explanation:
NEW QUESTION 74
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the DOM inspector to remove all the elements containing the class ad-library-item.
- B. Use the DOM inspector to prevent the load event to be fired.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the browser to execute a script that removes all the element containing the class ad-library-item.
Answer: D
NEW QUESTION 75
A 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?
Which three benefits of Node.js can the developer use to persuade their manager?
- A. Installs with its own package manager to install and manage third-party libraries.
- B. Performs a static analysis can code before execution to look for runtime errors.
- C. Uses non-blocking functionality for performant request handling
- D. Executes server-side JavaScript code to avoid learning a new language.
- E. Ensure stability with one major release every few years.
Answer: B
NEW QUESTION 76
Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?
- A. Console. error (number $ 2 == 0) ;
- B. Assert (number $ 2 == 0);
- C. Console. Assert ( number $ 2 == 0 ) ;
- D. Console. Debug (number $ 2 == 0) ;
Answer: C
NEW QUESTION 77
Refer to the code:
Given the code above, which three properties are set for pet1? Choose 3 answers
- A. name
- B. type
- C. speak
- D. owner
- E. canTalk
Answer: A,B,E
NEW QUESTION 78
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?
- A. [1, 2, 3, 4, 5, 4, 4]
- B. [1, 2, 3, 4, 5, 4]
- C. [1, 2, 3, 4, 4, 5, 4]
- D. [1, 2, 3, 5]
Answer: C
NEW QUESTION 79
Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
- A. JSON.Stringify and JSON.parse
- B. JSON,serialize and JSON,desrialize
- C. JSON.encode and JSON decode
- D. JSON.parse and JSON deserialize
Answer: B
NEW QUESTION 80
Which statement can a developer apply to increment the browser's navigation history without a page refesh?
- A. Window.history,state,push.(newStateObject, ' ' null;
- B. Window.history,pushState.(newStateObject, ' ', null)) ;
- C. Window.history,state,push.(newStateObject);
- D. Window.history,pushState.(newStateObject);
Answer: A
NEW QUESTION 81
Given a value, which three options can a developer use to detect of the value is NaN?
Choose 3 answers
- A. Value == Number, NaN
- B. Value == NaN
- C. Number , isNaN(value)
- D. Value I== value
- E. Object , is ( value, NaN)
Answer: B,C,E
NEW QUESTION 82
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