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Welcome to download the newest TestPassed JavaScript-Developer-I PDF dumps: https://www.testpassed.com/JavaScript-Developer-I-still-valid-exam.html ( 160 Q&As)
NEW QUESTION 66
Refer to the code below:
Considering the implementations of 'use strict' on line 04, which three statements describes the executes of the code? Choose 3 answers
- A. Z is equal to 3,14.
- B. 'use strict' has an effect only on line 05.
- C. 'use strict' has an effect between line 04 and the end of the file.
- D. Line 05 throws an error.
- E. 'use strict , is hoisted, so it has an effect on all lines.
Answer: A,D,E
NEW QUESTION 67
Refer to the code below:
What is the value of result when Promise. race executes?
- A. Car 1 crashed the race
- B. Race is cancelled.
- C. Car 2 completed the race
- D. Car 3 completed the race
Answer: A
NEW QUESTION 68
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. Ensure stability with one major release every few years.
- B. Executes server-side JavaScript code to avoid learning a new language.
- C. Installs with its own package manager to install and manage third-party libraries.
- D. Uses non-blocking functionality for performant request handling
- E. Performs a static analysis can code before execution to look for runtime errors.
Answer: E
NEW QUESTION 69
A developer wants to use a module named universalContainerLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?
- A. import - as lib from '/path/universalContainerLib.js''
lib.foo( ) ;
lib. bar ( ) ; - B. import all from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - C. import + from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - D. import (foo,bar) from '/path/universalContainerLib.js''
foo ( ) ;
bar ( ) ;
Answer: A
NEW QUESTION 70
Refer to the code below:
Which statement allows a developer to cancel the scheduled timed function?
- A. ClearTimeout (timeFunction);
- B. removeTimeout (timeFunction) ;
- C. removeTimeout (timerId) ;
- D. ClearTimeout (timerId) ;
Answer: B
NEW QUESTION 71
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. Assign variables to module, exports and require them as needed.
- B. Create a new window object in the root file.
- C. Assign variables to the global object.
- D. Use the document instead of the window object.
Answer: B,D
NEW QUESTION 72
Which statement parses successfully?
- A. JSON.parse ('' 'foo' '');
- B. JSON.parse ('' 'foo'' ');
- C. JSON.parse ('foo ');
- D. JSON.parse (''foo '');
Answer: D
NEW QUESTION 73
Which function should a developer use to repeatedly execute code at a fixed time interval?
- A. setPeriod
- B. setTimeout
- C. setInterval
- D. setInterim
Answer: C
NEW QUESTION 74
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, 4, 5, 4]
- C. [1, 2, 3, 4, 5, 4]
- D. [1, 2, 3, 5]
Answer: B
NEW QUESTION 75
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 76
Refer to the code below:
What is the value of result when the code executes?
- A. 5 - 10
- B. 10 - 5
- C. 5 - 5
- D. 10 - 10
Answer: D
NEW QUESTION 77
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 78
Which two console logs out NaN?
Choose 2 answers
- A. Console.log (10 / 0);
- B. Console.log(10 / 'five' ') ;
- C. Console.log(parseint ('two') ) ;
- D. Console.log(10 / Number ('5) );
Answer: B,C
NEW QUESTION 79
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 browser console to execute a script that prevents the load event to be fired.
- C. Use the browser to execute a script that removes all the element containing the class ad-library-item.
- D. Use the DOM inspector to remove all the elements containing the class ad-library-item.
Answer: C
NEW QUESTION 80
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
- A. Let arr2 = arr1.slice(0, 5);
- B. Let arr2 = Array.from(arr1);
- C. Let arr2 = arr1.sort();
- D. Let arr2 = arr1;
Answer: A,B
NEW QUESTION 81
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers
- A. IIFEs
- B. global variables
- C. cookies
- D. localStorage
- E. indexedDB
Answer: A,D,E
NEW QUESTION 82
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 83
Given the code below.
What is logged to the console?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION 84
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