Question # 1 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)));
Click for Answer
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)) ;
Question # 2 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, 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 to execute a script that removes all the element containing the class ad-library-item.
C. Use the DOM inspector to remove all the elements containing the class ad-library-item.
D. Use the browser console to execute a script that prevents the load event to be fired.
Click for Answer
B. Use the browser to execute a script that removes all the element containing the class ad-library-item.
Question # 3 In which situation should a developer include a try .. catch block around their function call ?
A. The function has an error that should not be silenced.
B. The function results in an out of memory issue.
C. The function might raise a runtime error that needs to be handled.
D. The function contains scheduled code
Click for Answer
C. The function might raise a runtime error that needs to be handled.
Question # 4 Refer to the code below: 01 let car1 = new promise((_, reject) => 02 setTimeout(reject, 2000, “Car 1 crashed in”)); 03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, “Car 2 completed”)); 04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, “Car 3 Completed”)); 05 Promise.race([car1, car2, car3]) 06 .then(value => ( 07 let result = $(value) the race. `; 08 )) 09 .catch( arr => ( 10 console.log(“Race is cancelled.”, err); 11 )); What is the value of result when Promise.race executes?
A. Car 3 completed the race.B. Car 1 crashed in the race.C. Car 2 completed the race.D. Race is cancelled.
Click for Answer
C. Car 2 completed the race.
Question # 5 Refer to the code below: for(let number =2 ; number <= 5 ; 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 require an import 2. Logs an error when the boolean statement evaluates to false 3. Works in both the browser and Node.js Which meet the requirements?
A. assert (number % 2 === 0);
B. console.error(number % 2 === 0);
C. console.debug(number % 2 === 0);
D. console.assert(number % 2 === 0);
Click for Answer
B. console.error(number % 2 === 0);
Question # 6 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? Choose 3 answers:
A. A. I nstalls with its own package manager to install and manage third-party libraries.
B. Ensures stability with one major release every few years.
C. Performs a static analysis on code before execution to look for runtime errors.
D. Executes server-side JavaScript code to avoid learning a new language.
E. User non blocking functionality for performant request handling .
Click for Answer
A. A. I nstalls with its own package manager to install and manage third-party libraries.
C. Performs a static analysis on code before execution to look for runtime errors.
E. User non blocking functionality for performant request handling .
Question # 7 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]
Click for Answer
Question # 8 Refer to the code below: Let foodMenu1 = [‘pizza’, ‘burger’, ‘French fries’]; Let finalMenu = foodMenu1; finalMenu.push(‘Garlic bread’); What is the value of foodMenu1 after the code executes?
A. [ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]
B. [ ‘pizza’,’Burger’, ‘French fires’]
C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]
D. [ ‘Garlic bread’]
Click for Answer
B. [ ‘pizza’,’Burger’, ‘French fires’]
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