Latest Success Metrics For Actual JavaScript-Developer-I Exam (Updated 223 Questions)
Genuine JavaScript-Developer-I Exam Dumps Free Demo Valid QA's
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NEW QUESTION # 16
Refer to the code below:
What is the value of result when the code executes?
- A. 5-10
- B. 5-5
- C. 10-10
- D. 10-5
Answer: C
NEW QUESTION # 17
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Hello and salutation is I say hello.
- B. Greeting is Hello and salutation is Hello, Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Goodbye and salutation is I say Hello.
Answer: B
NEW QUESTION # 18
A developer at Universal Containers creates a new landing page based on HTML, CSS, and
JavaScript TO ensure that visitors have a good experience, a script named personaliseContext
needs to be executed when the webpage is fully loaded (HTML content and all related files ), in
order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above
business requirement?
- A. Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);
- B. document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);
- C. window.addEventListener('load',personalizeWebsiteContext);
- D. window.addEventListener('onload', personalizeWebsiteContext);
Answer: C
NEW QUESTION # 19
Which function should a developer use to repeatedly execute code at a fixed time interval?
- A. setPeriod
- B. setInterim
- C. setTimeout
- D. setInterval
Answer: D
NEW QUESTION # 20
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PrincePrettyPrint. Js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint modules for this import to work?
- A. printPrice must be a multi export
- B. printPrice must be an default export
- C. printPrice must be named export
- D. printPrice must be an all export
Answer: C
NEW QUESTION # 21
Which function should a developer use to repeatedly execute code at a fixed interval ?
- A. setIntervel
- B. setPeriod
- C. setInteria
- D. setTimeout
Answer: A
NEW QUESTION # 22
Which two console logs output NaN?
Choose 2 answers | |
- A. console.log(10 / Number('5) ) ;
- B. console.loeg(10 / 'five');
- C. console.log(10 / 0);
- D. console.log(parseInt ' ("two')) ;
Answer: B,D
NEW QUESTION # 23
Considering type coercion, What does the following expression evaluate to?
True + '13 ' + NaN
- A. 113NaN
- B. 'true13NaN'
- C. 0
- D. 'true13'
Answer: A
NEW QUESTION # 24
Refer to the code below:
function foo () {
const a =2;
function bat() {
console.log(a);
}
return bar;
}
Why does the function bar have access to variable a ?
- A. Hoisting
- B. Outer function's scope
- C. Prototype chain
- D. Inner function's scope
Answer: B
NEW QUESTION # 25
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
- A. Substitution
- B. Black box
- C. Stubbing
- D. White box
Answer: A,D
NEW QUESTION # 26
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated to false?
- A. Let x = (1' + '2') === (6 / 2) ;
- B. Let x = (1' + '2') == (6 + 2) ;
- C. Let x = (1' + '2') === (6 + 2) ;
- D. Let x = (1' + '2') == ('6' / 2) ;
Answer: C
NEW QUESTION # 27
A developer wants to create a simple image upload in the browser using the File API. The HTML is below:
The JavaScript portion is:
In lines 04 and 08, which code allows the user to select an image from their local computer, and to display the image in the browser?
- A. 04 const reader = new File ( ) ;
08 if (file) ,reader, readerAsDataURL (file) ; - B. 04 const reader = new FileReader ( ) ;
08 if (file) reader , createAsDataURL (file) ; - C. 04 const reader = new FileReader ( ) ;
08 if (file) URL , createObjectURL (file) ; - D. 04 const reader = new File ( ) ;
08 if (file) URL , createObjectURL (file) ;
Answer: D
NEW QUESTION # 28
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. All
- B. Named
- C. default
- D. Multi
Answer: B
NEW QUESTION # 29
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want 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. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
- B. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
- C. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
- D. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;
Answer: C
NEW QUESTION # 30
A developer has the function, shown below, that is called when a page loads.
Where can the developer see the log statement after loading the page in the browser?
- A. On the webpage
- B. Browser javaScript console
- C. Terminal running the web server.
- D. Browser performance tools
Answer: B
NEW QUESTION # 31
A developer needs to test this functions:
Which two assert statements are valid tests for this function?
- A. Console.assert(sum3([0]) 0) ;
- B. Console.assert(sum3((1, '2' ]) 12 );
- C. Console.assert(sum3 ([-3, 2]) -1) ;
- D. Console.assert(sum3 (['hello' 2, 3, 4]) NaN);
Answer: B,C
NEW QUESTION # 32
Given the code below:
What happens when the code executes?
- A. The ur1 variable has global scope and line 02 throws an error.
- B. The ur1 variable has local scope and line 02 executes correctly.
- C. The ur1 variable has global scope and line 02 executes correctly.
- D. The ur1 variables has local scope and line 02 throws an error.
Answer: C
NEW QUESTION # 33
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- B. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
- C. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- D. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
Answer: C
NEW QUESTION # 34
Refer to the HTML below:
Which JavaScript statement results in changing " The Lion."?
- A. document.querySelector('$main li:second-child').innerHTML = " The Lion ';
- B. document.querySelector('$main li:nth-child(2)'),innerHTML = " The Lion. ';
- C. document.querySelectorAll('$main $TONY').innerHTML = '" The Lion
- D. document.querySelector('$main li.Tony').innerHTML = '" The Lion ';
Answer: C
NEW QUESTION # 35
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
- A. Mocking
- B. Integration
- C. Black box
- D. White box
Answer: A,D
NEW QUESTION # 36
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an event and start the web server ?
- A. server.on(' connect ' , ( port) => {
console.log('Listening on ' , port) ;}) - B. Server.start ();
- C. console.log( 'Listening on ', port) ;
- D. serve(( port) => (
- E. server()
Answer: A
NEW QUESTION # 37
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 prevent the load event to be fired.
- B. Use the DOM inspector to remove all the elements containing the class ad-library-item.
- 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 # 38
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:
- A. A variable displaying the number of instances created for the Car Object.
- B. The style, event listeners and other attributes applied to the carSpeed DOM element
- C. The information stored in the window.localStorage property
- D. The values of the carSpeed and fourWheels variables
Answer: B,C
NEW QUESTION # 39
Refer to the code below:
let sayHello = () => {
console.log ('Hello, world!');
};
Which code executes sayHello once, two minutes from now?
- A. setInterval(sayHello, 12000);
- B. delay(sayHello, 12000);
- C. setTimeout(sayHello(), 12000);
- D. setTimeout(sayHello, 12000);
Answer: D
NEW QUESTION # 40
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers
- A. console.assert(Number.isNaN(toNumber()));
- B. console.assert(toNumber('-3') < 0);
- C. console.assert(toNumber('2') === 2);
- D. console.assert(toNumber () === NaN);
Answer: B,C
NEW QUESTION # 41
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