Salesforce Javascript-Developer-I Salesforce Certified JavaScript Developer I Exam Exam Practice Test Questions

• Question 1

  A developer copied a JavaScript object:How does the developer access dan's forstName,lastName? Choose 2 answers

  • dan,name
  • dan,firstname ( ) + dan, lastName ( )
  • dan, firstName = dan.lastName
  • dan,name ( )

  Show Answer Answer: C, D Next

• Question 2

  A developer creates a simple webpage with an input field. When a user enters text inthe input field and clicks the button, the actual value of the field must be displayed in theconsole.Here is the HTML file content:<input type ='' text'' value=''Hello'' name =''input''><button type =''button'' >Display </button>The developer wrote the javascript code below:Const button = document.querySelector('button');button.addEvenListener('click', () => (Const input = document.querySelector('input');console.log(input.getAttribute('value'));When the user clicks the button, the output is always ''Hello''.What needs to be done make this code work as expected?

  • Replace line 04 with console.log(input .value);
  • Replace line 03 with const input = document.getElementByName('input');
  • Replace line 02 with button.addEventListener(''onclick'', function() {
  • Replace line 02 with button.addCallback(''click'', function() {

  Show Answer Answer: A Next

• Question 3

  Universal Containers (UC) notices that its application that allows users to search foraccounts makes a network request each time a key is pressed. This results in too manyrequests for the server to handle. Address this problem, UC decides to implement a debounce function on string changehandler.What are three key steps to implement this debounce function?Choose 3 answers:

  • If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.
  • When the search string changes, enqueue the request within a setTimeout.
  • Ensure that the network request has the property debounce set to true.
  • If there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timerId and replace it with a new setTimeout.
  • Store the timeId of the setTimeout last enqueued by the search string change handle.

  Show Answer Answer: A, B, C Next

• Question 4

  Given the following code:let x = null;console.log(typeof x);What is the output?

  • 'object'
  • 'undefined'
  • 'null'
  • 'x'

  Show Answer Answer: A Next

• Question 5

  Refer to the code belowlet inArray = [[1,2],[3,4,5]];which two statements results in the array [1,2,3,4,5]?choose 2 answer

  • [ ].concat(...inArray);
  • [ ].concat.apply(inArray,[ ]);
  • [ ].concat([...inArray])
  • [ ].concat.apply([ ],inArray);

  Show Answer Answer: A, D Next