Certification Training for JavaScript-Developer-I Exam Dumps Test Engine [2021]
Aug 28, 2021 Step by Step Guide to Prepare for JavaScript-Developer-I Exam
NEW QUESTION 80
Given the code below:
What is logged to the console?
- A. 1 2 4 3 5
- B. 1 2 5 3 4
- C. 2 5 1 3 4
- D. 2 1 4 3 5
Answer: C
NEW QUESTION 81
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) URL , createObjectURL (file) ; - C. 04 const reader = new File ( ) ;
08 if (file) URL , createObjectURL (file) ; - D. 04 const reader = new FileReader ( ) ;
08 if (file) reader , createAsDataURL (file) ;
Answer: C
NEW QUESTION 82
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Goodbye and salutation is I say Hello.
- B. Greeting is Goodbye and salutation is Hello, Hello.
- C. Greeting is Hello and salutation is Hello, Hello.
- D. Greeting is Hello and salutation is I say hello.
Answer: C
NEW QUESTION 83
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 added the dependency as a dev dependency, and NOOK_ENV is set to production.
- B. The developer added the dependency as a dev dependency, and NODK_ENV is set to production.
- C. The developer missed the option -ssve when adding the dependency.
- D. The developer missed the option - add when adding the dependency.
Answer: A,B,C
NEW QUESTION 84
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?
- A. Window. === name is assigned to ''hello'' and the variable a n remain undefined.
- B. The a variable is assigned the correct object.
- C. Window. n is assigned the correct object.
- D. The n variable is assigned the correct object but this- remains undefined.
Answer: A
NEW QUESTION 85
A developer publishes a new version of a package with new feature that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?
- A. 2.0.0
- B. 1.2.3
- C. 1.2.0
- D. 1.1.4
Answer: C
NEW QUESTION 86
Refer to the following code:
What is returned by the function call on line 13?
- A. Line 13 throws an error.
- B. Null value
- C. Undefined value.
- D. Undefined
Answer: A
NEW QUESTION 87
Refer to the code snippet:
A developer writes this code to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
What is the return of msg when getivelibilityMessage ('' bewUserName') is executed and getAvailability (''newUserName'') returns false?
- A. ''msg is not defined''
- B. ''newUsername''
- C. undefined
- D. ''Username available''
Answer: C
NEW QUESTION 88
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web 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. DEBUG=http, https node server.js
- B. NODE_DEBUG=true node server.js
- C. NODE_DEBUG=http,https node server.js
- D. DEBUG=true node server.js
Answer: D
NEW QUESTION 89
Refer to the code below:
Which two function can replace line 01 and return 58 to sum? Choose 2 answers
- A. Const addby = function (num1) (
Return function (num2) (
}
} - B. const addBy = function (num1) {
Return function (num2) {
}
} - C. const addBy = num1 (num2) => num1 + num2 ;
- D. const addBy = (num1) num1 + num2
Answer: B,C
NEW QUESTION 90
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.
Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers
- A. Message
- B. Info
- C. error
- D. Log
- E. Assert
Answer: A,C,E
NEW QUESTION 91
Given the JavaSript below:
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
- A. none' ; 'block '
- B. 'hidden'; 'visible'
- C. 'Visible' ; hidden'
- D. 'Block' ; 'none'
Answer: D
NEW QUESTION 92
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers
- A. Var1 && var2
- B. Var1. Toboolean ( ) && var2, to Boolean ( )
- C. Boolean (var1) && Boolean (var2)
- D. Boolean (var1 && var2)
Answer: B,D
NEW QUESTION 93
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
This is a Shirt
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
Unicaught TypeError: saleitem, description is not a function
This is a Scarf
This is a discounted Shirt
Answer: B
NEW QUESTION 94
Refer to the code below:
What are the values for first and second once the executes?
- A. First is why and second is where.
- B. First is who and second is where.
- C. First is why and second is when.
- D. First is who and second is when.
Answer: A
NEW QUESTION 95
A developer is wondering whether to use, promise, then or provise, catch especially when a promise throws an error.
Which two promises are rejected? Choose 2 answers
- A. Promise , reject ('Cool error here ') , catch (error => console ,error (error));
- B. Promise, rejected (Cool error here'), then (error => console (error ));
- C. New promise (() => (throw 'Cool error here ')) , then ((null, error => console, (error)));
- D. New Promise((resolve, reject) => ( throw 'Cool error here')) .catch (error => console (error ));
Answer: C,D
NEW QUESTION 96
A developer implements and calls the following code when an application state change occurs:
If the back button is clicked after this method is executed, what can a developer expect?
- A. A popstate event is fired with a state properly that details the application's last state.
- B. A navigate event is fired with a state properly that details previous application state.
- C. The page reloads and all JavaScript is reinitialized.
- D. The page is navigated away from and previous page in the browser's history is loaded.
Answer: D
NEW QUESTION 97
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