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

Salesforce JAVASCRIPT-DEVELOPER-I Online Questions & Answers

• Question 31:

  Given the following code:

  Counter = 0;

  const logCounter = () => {

  console.log(counter);

  );

  logCounter();

  setTimeout(logCOunter, 1100);

  setInterval(() => {

  Counter++

  logCounter();

  }, 1000);

  What is logged by the first four log statements?

  A. 0 0 1 2
  B. 0 1 2 3
  C. 0 1 1 2
  D. 0 1 2 2
  C. 0 1 1 2

• Question 32:

  Which code statement below correctly persists an objects inlocal Storage ?

  

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

• Question 33:

  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 array after the code executes?

  

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

• Question 34:

  A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript TO ensure that visitors have a goodexperience, a script named personaliseContext needs to be executed when the webpage is fully loaded (HTML content and all related files ), in

  order to do some custom initialization.

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

  A. document.addEventListener(`'onDOMContextLoaded', personalizeWebsiteContext);
  B. window.addEventListener(`load',personalizeWebsiteContext);
  C. window.addEventListener(`onload', personalizeWebsiteContext);
  D. Document.addEventListener(``'DOMContextLoaded' , personalizeWebsiteContext);
  B. window.addEventListener(`load',personalizeWebsiteContext);

• Question 35:

  A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate (). How can a developer import and use the printDate() function?

  

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

  ---

  Explanation/Reference:

• Question 36:

  Given the code below:

  01 function GameConsole (name) {

  02 this.name = name;

  03 }

  05 GameConsole.prototype.load = function(gamename) {

  06 console.log( ` $(this.name) is loading agame : $(gamename) ...`);

  07 )

  08 function Console 16 Bit (name) {

  09 GameConsole.call(this, name) ;

  10 }

  11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;

  12 //insert code here

  13 console.log( ` $(this.name) is loading a cartridge game :$(gamename) ...`);

  14 }

  15 const console16bit = new Console16bit(` SNEGeneziz ');

  16 console16bit.load(` Super Nonic 3x Force ');

  What should a developer insert at line 15 to output the following message using the method ?

  > SNEGeneziz is loading a cartridgegame: Super Monic 3x Force . . .

  A. Console16bit.prototype.load(gamename) = function() {
  B. Console16bit.prototype.load = function(gamename) {
  C. Console16bit = Object.create(GameConsole.prototype).load = function (gamename) {
  D. Console16bit.prototype.load(gamename) {
  B. Console16bit.prototype.load = function(gamename) {

• Question 37:

  Developer uses the code below to format a date.

  

  After executing, what is the value of formatted Date?

  A. May 10, 2020
  B. June 10, 2020
  C. October 05, 2020
  D. November 05, 2020
  B. June 10, 2020

• Question 38:

  Which three options show valid methods for creating a fat arrow function? Choose 3 answers

  A. x => ( console.log(` executed ') ; )
  B. [ ] => ( console.log(` executed ') ;)
  C. ( ) => ( console.log(` executed ') ;)
  D. X,y,z => ( console.log(` executed ') ;)
  E. (x,y,z) => ( console.log(` executed ') ;)
  A. x => ( console.log(` executed ') ; )
  E. (x,y,z) => ( console.log(` executed ') ;)

• Question 39:

  Given code below:

  setTimeout (() => (

  console.log(1);

  ). 0);

  console.log(2);

  New Promise ((resolve, reject )) = > (

  setTimeout(() => (

  reject(console.log(3));

  ). 1000);

  )).catch(() => (

  console.log(4);

  ));

  console.log(5);

  What is logged to the console?

  A. 2 1 4 3 5
  B. 2 5 13 4
  C. 1 2 4 3 5
  D. 1 2 5 3 4
  B. 2 5 13 4

• Question 40:

  A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N. Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},

  {"name" : "Natham"},{"name" : "nathaniel"}

  Refer to the code snippet below:

  01 arrObj.reduce(( acc, curr) => {

  02 //missing line 02

  02 //missing line 03

  04 ).0);

  Which missing lines 02 and 03 return the correct count?

  A. Const sum = curr.startsWith(`N') ? 1: 0; Return acc +sum
  B. Const sum = curr.name.startsWith(`N') ? 1: 0; Return acc +sum
  C. Const sum = curr.startsWIth(`N') ? 1: 0; Return curr+ sum
  D. Constsum = curr.name.startsWIth(`N') ? 1: 0; Return curr+ sum
  B. Const sum = curr.name.startsWith(`N') ? 1: 0; Return acc +sum