JavaScript Developer I V2

Refer to the code below: const event = new CustomEvent( //Missing Code ); obj.dispatchEvent(event); A developer needs to dispatch a custom event called update to send information about recordId. Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answersA . ‘Update’,...

A developer is creating a simple webpage with a button. When a userclicks this button for the first time, a message is displayed. The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first...

A developer is debugging a web server that uses Node.js The server hits a runtime error every third request to an important endpoint on the web server. The developer added a break point to the start script, that is at index.js at he root of the server’s source code. The...

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: Class Item { constructor(name, price) { … //...

Which statement phrases successfully?A . JSON.parse (‘ foo ’ );B . JSON.parse (“ foo ” );C . JSON.parse( “ ‘ foo ’ ” );D . JSON.parse(‘ “ foo ” ’);View AnswerAnswer: D

Which two code snippets show working examples of a recursive function? Choose 2 answersA . Let countingDown = function(startNumber) { If ( startNumber >0) { console.log(startNumber) ; return countingDown(startNUmber); } else { return startNumber; }};B . Function factorial ( numVar ) { If (numVar < 0) return; If ( numVar...

Refer to the code below: Let car1 = new Promise((_, reject) => setTimeout(reject, 2000, “car 1 crashed in” => Let car2 =new Promise(resolve => setTimeout(resolve, 1500, “car 2 completed”) Let car3 =new Promise(resolve =>setTimeout(resolve, 3000, “car 3 completed”) Promise.race(( car1, car2, car3)) .then (value => ( Let result = ‘$(value)...

Whichthree actions can be using the JavaScript browser console? Choose 3 answers:A . View and change DOM the page.B . Display a report showing the performance of a page.C . Run code that is not related to page.D . view, change, and debug the JavaScript code of the page.E ....

Given two expressions var1 and var2. What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean? Choose 2 answers:A . Boolean(var1 && var2)B . var1 && var2C . var1.toBoolean() && var2toBoolean()D . Boolean(var1) && Boolean(var2)View AnswerAnswer: A,D

Considering type coercion, what does the following expression evaluate to? True + ‘13’ + NaNA . ‘ 113Nan ’B . 14C . ‘ true13 ’D . ‘ true13NaN ’View AnswerAnswer: D