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

• Question 1

  Refer to code below:function Person() {this.firstName = 'John';}Person.prototype ={Job: x => 'Developer'};const myFather = new Person();const result =myFather.firstName + ' ' + myFather.job();What is the value of the result after line 10 executes?

  • Error: myFather.job is not a function
  • Undefined Developer
  • John undefined
  • John Developer

  Show Answer Answer: D Next

• Question 2

  Which statement phrases successfully?

  • JSON.parse ( ' foo ' );
  • JSON.parse ( '' foo '' );
  • JSON.parse( '' ' foo ' '' );
  • JSON.parse(' '' foo '' ');

  Show Answer Answer: D Next

• Question 3

  Refer to the HTML below:<ul><li>Leo</li><li>Tony</li><li>Tiger</li></ul>Which JavaScript statement results in changing '' Tony'' to ''Mr. T.''?

  • Document.querySelectorAll('$main $TONY').innerHTML = ' Mr. T. ';
  • Document.querySelector('$main li:second-child').innerHTML = ' Mr. T. ';
  • Document.querySelector('$main li.Tony').innerHTML = ' Mr. T. ';
  • Document.querySelector('$main li:nth-child(2)'),innerHTML = ' Mr. T. ';

  Show Answer Answer: D Next

• Question 4

  Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?Choose 3 answers

  • Z is equal to 3.14.
  • 'use strict' is hoisted, so it has an effect on all lines.
  • 'use strict' has an effect only on line 05.
  • 'use strict' has an effect between line 04 and the end of the file.
  • Line 05 throws an error.

  Show Answer Answer: A, C, E Next

• Question 5

  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