Salesforce JAVASCRIPT-DEVELOPER-I Online Practice Questions and Exam Preparation

Salesforce JAVASCRIPT-DEVELOPER-I Online Questions & Answers

• Question 51:

  Which two code snippetsshow working examples of a recursive function?

  Choose 2 answers

  A. 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 === 0 ) return 1; return numVar -1;
  C. Const sumToTen = numVar => { If (numVar < 0) Return; return sumToTen(numVar + 1)};
  D. Const factorial =numVar => { If (numVar < 0) return; If ( numVar === 0 ) return 1; returnnumVar * factorial ( numVar - 1 ); };
  A. Let countingDown = function(startNumber) { If ( startNumber >0) { console.log(startNumber) ; return countingDown(startNUmber); } else { return startNumber; }};
  D. Const factorial =numVar => { If (numVar < 0) return; If ( numVar === 0 ) return 1; returnnumVar * factorial ( numVar - 1 ); };

• Question 52:

  A developer at Universal Containers is creating their new landing page basedon HTML, CSS, and JavaScript. The website includes multiple external resources that are loaded when the page is opened.

  To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage Is loaded and there Is no need to wait for the resources to be available.

  Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

  A. windows,addEventListener('load', personalizeWebsiteContent);
  B. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);
  C. windows,addEventListener('onload', personalizeWebsiteContent);
  D. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);
  A. windows,addEventListener('load', personalizeWebsiteContent);

• Question 53:

  Refer to the following code:

  01 function Tiger(){

  02 this.Type = `Cat';

  03 this.size = `large';

  04 }

  06 let tony = new Tiger();

  07 tony.roar = () =>{

  08 console.log(`They\'re great1');

  09 };

  11 function Lion(){

  12 this.type = `Cat';

  13 this.size = `large';

  14 }

  16 let leo = new Lion();

  17//Insert code here

  18 leo.roar();

  Which two statements could be inserted at line 17 to enable the function call on line 18?

  Choose 2 answers.

  A. Leo.roar = () => { console.log(`They\'re pretty good:'); };
  B. Object.assign(leo,Tiger);
  C. Object.assign(leo,tony);
  D. Leo.prototype.roar = () => { console.log(`They\'re pretty good:'); };
  A. Leo.roar = () => { console.log(`They\'re pretty good:'); };
  C. Object.assign(leo,tony);

• Question 54:

  Why would a developerspecify a package.jason as a developed forge instead of a dependency?

  A. It is required by the application in production.
  B. It is only needed for local development and testing.
  C. Other required packages depend on it for development.
  D. It should be bundled when the package is published.
  B. It is only needed for local development and testing.

• Question 55:

  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 time.

  01 functionlisten(event) {

  02 alert ( `Hey! I am John Doe') ;

  03 button.addEventListener (`click', listen);

  Which two code lines make this code work as required?

  Choose 2 answers

  A. On line 02, use event.first to test if it is the first execution.
  B. On line 04, useevent.stopPropagation ( ),
  C. On line 04, use button.removeEventListener(` click" , listen);
  D. On line 06, add an option called once to button.addEventListener().
  C. On line 04, use button.removeEventListener(` click" , listen);
  D. On line 06, add an option called once to button.addEventListener().

• Question 56:

  Refer to the code below:

  

  Whatis the value of result after line 10 executes?

  A. Error: myFather.job is not a function
  B. John Developer
  C. undefined Developer
  D. John undefined
  B. John Developer

• Question 57:

  A developer has an ErrorHandler module that contains multiple functions. What kind of export should be leveraged so that multiple functions can be used?

  A. all
  B. named
  C. multi
  D. default
  B. named

• Question 58:

  After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.

  The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.

  Which two actions will help determine accurate results?

  Choose 2 answers

  A. The developer should inspect their browser refresh settings.
  B. The tester should disable their browser cache.
  C. The developer should rework the code.
  D. The tester should dear their browser cache.
  A. The developer should inspect their browser refresh settings.
  D. The tester should dear their browser cache.

• Question 59:

  A developer is trying to handle an error within a function.

  Which code segment shows the correct approach to handle an error without propagating it elsewhere?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  D. Option D

• Question 60:

  Refer to the code below:

  let o = {

  get js() {

  let city1 = String("st. Louis");

  let city2 = String(" New York");

  return {

  firstCity: city1.toLowerCase(),

  secondCity: city2.toLowerCase(),

  }

  }

  }

  What value can a developer expect when referencing o.js.secondCity?

  A. Undefined
  B. ` new york '
  C. ` New York '
  D. An error
  B. ` new york '