All About 100% Guarantee JavaScript-Developer-I Exam Engine

NEW QUESTION 1
A developer is leading the creation of a new browser application that will serve a single page application. The teamwants to use a new web framework Minimalsit.js. The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for? Choose 2 answers

• A. Vue
• B. Angular
• C. Koa
• D. Express

Answer: BD

NEW QUESTION 2
developer wants to use a module nameduniversalContainersLib 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. import * ad lib from ‘/path/universalContainersLib.js’; lib.foo();lib.bar();
• B. import (foo, bar) from ‘/path/universalContainersLib.js’; foo();bar();
• C. import all from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();
• D. import * from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();

Answer: A

NEW QUESTION 3
Universal Container(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 do everything and log the time each of these three suspicious functions consumes.
console.time(‘Performance’); maybeAHeavyFunction(); thisCouldTakeTooLong(); orMaybeThisOne(); console.endTime(‘Performance’);
Which function can the developer use to obtain the time spent by every one of the three functions?

• A. console.timeLog()
• B. console.getTime()
• C. console.trace()
• D. console.timeStamp()

Answer: A

NEW QUESTION 4
Which three browser specific APIs are available for developers to persist data between page loads ? Choose 3 answers

• A. IIFEs
• B. indexedDB
• C. Global variables
• D. Cookies
• E. localStorage.

Answer: ABE

NEW QUESTION 5
Refer to code below:

What are the values for first and second once the code executes ?

• A. First is Who and second is When
• B. First is why and second is where
• C. First is who and second is where
• D. First is why andsecond is when

Answer: D

NEW QUESTION 6
Refer to the code below:

Why does the function bar have access to variable a ?

• A. Inner function’s scope
• B. Hoisting
• C. Outer function’s scope
• D. Prototype chain

Answer: C

NEW QUESTION 7
Refer to the following code:

What is returned by the function call on line 13?

• A. Undefined
• B. Line 13 throws an error.
• C. ‘Undefined values!’
• D. ‘Null value!’

Answer: A

NEW QUESTION 8
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. Promise.reject(‘cool error here’).then(error => console.error(error));
• B. Promise.reject(‘cool error here’).catch(error => console.error(error));
• C. New Promise((resolve, reject) => (throw ‘cool error here’}).catch(error => console.error(error)) ;
• D. New Promise(() => (throw ‘cool error here’}).then(null, error => console.error(error)));

Answer: BC

NEW QUESTION 9
A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below: ClassPost {
// Insert code here This.body =body This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

• A. super (body, author, viewCount) {
• B. Function Post (body, author, viewCount) {
• C. constructor (body, author, viewCount) {
• D. constructor() {

Answer: C

NEW QUESTION 10
Which three actions can be using the JavaScript browser console? Choose 3 answers:

• A. View and change DOM the page.
• B. Display a report showing the performance of a page.
• C. Run code that is not related to page.
• D. view , change, and debug the JavaScript code of the page.
• E. View and change security cookies.

Answer: ACD

NEW QUESTION 11
Referto the code below: Const pi = 3.1415326, What is the data type of pi?

• A. Double
• B. Number
• C. Decimal
• D. Float

Answer: B

NEW QUESTION 12
A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = ‘July’; const year = 2019;
if(year === 2019) { monthName = ‘June’;
}
Which line edit should be made to make this code run?

• A. 01 let monthName =’July’;
• B. 02 let year =2019;
• C. 02 const year = 2020;
• D. 03 if (year == 2019) {

Answer: A

NEW QUESTION 13
Refer to the code below: let timeFunction =() => {
console.log(‘Timer called.”);
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

• A. removeTimeout(timedFunction);
• B. removeTimeout(timerId);
• C. clearTimeout(timerId);
• D. clearTimeout(timedFunction);

Answer: C

NEW QUESTION 14
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 the array after the code executes?

• A. [1, 2, 3, 4, 5, 4, 4]
• B. [1, 2, 3, 4, 4, 5, 4]
• C. [1, 2, 3, 4, 5, 4]
• D. [1, 2, 3, 5]

Answer: C

NEW QUESTION 15
Refer to the following code that imports a module named utils:

Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

• A.
• B.
• C.
• D.

Answer: BC

NEW QUESTION 16
Refer to HTML below:
<p> The current status of an Order: <span id =”status”> In Progress </span> </p>.
Which JavaScript statement changes the text ‘In Progress’ to ‘Completed’ ?

• A. document.getElementById(“status”).Value = ’Completed’ ;
• B. document.getElementById(“#status”).innerHTML = ’Completed’ ;
• C. document.getElementById(“status”).innerHTML = ’Completed’ ;
• D. document.getElementById(“.status”).innerHTML = ’Completed’ ;

Answer: C

NEW QUESTION 17
Refer to the code below: Let textValue = ’1984’;
Which code assignment shows a correct way to convert this string to an integer?

• A. let numberValue = Number(textValue);
• B. Let numberValue = (Number)textValue;
• C. Let numberValue = textValue.toInteger();
• D. Let numberValue = Integer(textValue);

Answer: A

NEW QUESTION 18
A developer implements and calls the following code when an application state change occurs: Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ‘ ’, null);
}
If the back button is clicked after this method is executed, what can a developer expect?

• A. A navigate event is fired with a state property that details the previous application state.
• B. The page is navigated away from and the previous page in the browser’s history is loaded.
• C. The page reloads and all Javascript is reinitialized.
• D. A popstate event is fired with a state property that details the application’s last state.

Answer: B

NEW QUESTION 19
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