[Apr 07, 2022] Fully Updated Dumps PDF - Latest JavaScript-Developer-I Exam Questions and Answers
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NEW QUESTION 31
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A. A
- B. C
- C. B
- D. D
Answer: A
NEW QUESTION 32
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boost with an event?
- A. Try{
server.start();
} catch(error) { - B. Server.error ((server) => {
console.log('ERROR', error);
}); - C. Server.on ('error', (error) => {
console.log('ERROR', error);
}); - D. Server.catch ((server) => {
console.log('ERROR', error);
});
Answer: C
Explanation:
console.log('ERROR', error);
}
NEW QUESTION 33
Which code statement below correctly persists an object in localStorage?
- A. const setLocalstorage = (storageKey , jsobject) => (
windows. LocalStorage,setitem(storagekey. jSON,string
) - B. Const setlocalstorage = (storagekey, jsObject) => (
Window. Localstorage.persist (storagekey, jsObject);
) - C. Const setLocalstorage = (jsobject ) => (
Window .localstorage .setitem (jsobject) ; - D. const setLocalstorage = (jsobject) =>
Windows.localstorage.connectobject(jsObject);
Answer: D
NEW QUESTION 34
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 Hello, Hello.
- B. Greeting is Goodbye and salutation is I say Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Hello and salutation is I say hello.
Answer: A
NEW QUESTION 35
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
What is the output of the code execution?
- A. TypeError: Assignment to constant variable
- B. TypeError: dan.name is not a function
- C. Hello Dan Doe
- D. Hello John Doe
Answer: B
NEW QUESTION 36
Refer to the following code that imports a module named Utills,
Which two implementations of Utill, je export foo and bar such that the code above runs without error?
Choose 2 answers
- A. //FooUtill.js and barUtils, js exist
Import (foo) from ,/Path/footUtils.js,:
Export (foo, bar) - B. Export default class (
Foo ( ) ( return 'foo ,; )
Bar ( ) ( return ;bar ; ) - C. Const foo = () => ( return 'foo ' ; )
Const bar => ( return 'bar' ; )
Export (foo, bar) - D. Const foo = ( ) => ( return 'foo; ; )
Const bar => => { return 'bar ';}
Export default foo, bar;
Answer: B
NEW QUESTION 37
Refer to the code below:
Let inArray - [ [1, 2] , [3, 4, 5] ];
Which two statements result in the array [1, 2, 3, 4, 5 ]?
- A. [ ] . concat. Apply (inArray, [ ] );
- B. [ ] . concat. ( ... inArray) ;
- C. [ ] . concat. Apply ( [ ], inArray) ;
- D. [ ]. Concat ( [...InArray] );
Answer: C,D
NEW QUESTION 38
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 39
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. The pseudocode is below:
There is a new requirement for a developer to implement a description method that will retrun a brief description for item and saleitem.
What is the out when executing the code above?
- A. This is a Scaf
Uncaught TypeError: saleItem, description is not a function
This is a Shirt
This is a discounted Shirt - B. This is a Scarf
Unicaught TypeError: saleitem, description is not a function
This is a Scarf
This is a discounted Shirt - C. This is a Scarf
This is a Shirt
This is a discounted Scard
This is a discounted Shirt - D. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
Answer: D
NEW QUESTION 40
A developer has a server running with Node.js. the command to start the web server is node server.js. the server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?
- A. DEBUO=http, https node server,js
- B. DEBUO=true node server,js
- C. NODE_DEBUO=true node server,js
- D. NODE_DEBUO=http, https node server,js
Answer: A
NEW QUESTION 41
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 42
Which two code snippets show working examples of a recursive function?
Choose 2 answers
A)
B)
C)
D)
- A. Option C
- B. Option B
- C. Option A
- D. Option D
Answer: A,D
NEW QUESTION 43
Refer to the code below:
Which assertion accurately tests the above code?
- A. Console, assert ( await functionalUnderTest (true) , 'not ok' )
- B. Console, assert (functionalUnderTest (true) , 'ok')
- C. Console, assert ( await functionalUnderTest (true) , 'not ok) )
- D. Console, assert ( await functionalUnderTest (true) , 'ok
Answer: B
NEW QUESTION 44
The developer has a function that prints ''Hello'' to an input name. To test this, the developer created a function that returns world''.
What can the developer do to change the code to print ''Hello world''?
- A. Change line 2 to console.log ( 'Hello', name () );
- B. Change line 9 to sayhello (world () ;
- C. Change line 5 to function world () (
- D. Change line 7 to ) () ;
Answer: D
NEW QUESTION 45
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 46
Which statement parses successfully?
- A. JSON. parse (""foo"');
- B. JSON.parse ("foo");
- C. JSON.parse (""foo'");
- D. JSON.parse ("foo");
Answer: A
NEW QUESTION 47
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 Hello, Hello.
- B. Greeting is Goodbye and salutation is I say Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Hello and salutation is I say hello.
Answer: A
NEW QUESTION 48
Given the following code:
is the output of line 02?
- A. ''null'''
- B. ''undefined''
- C. ''object''
- D. ''x''
Answer: C
NEW QUESTION 49
......
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