Salesforce Salesforce Certifications JAVASCRIPT-DEVELOPER-I Questions & Answers

• Question 181:

  Which statement can a developer apply to increment the browser's navigation history without a page refresh?

  A. window.history.pushState(newStateObject);

  B. window.history.pushStare(newStateObject, ' ', null);

  C. window.history.replaceState(newStateObject,' ', null);

  D. window.history.state.push(newStateObject);

  Correct Answer: C

• Question 182:

  Which option is true about the strict mode in imported modules?

  A. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.

  B. You can only reference notStrict() functions from the imported module.

  C. Imported modules are in strict mode whether you declare them as such or not.

  D. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.

  Correct Answer: B

• Question 183:

  A developer creates a simple webpage with an input field. When auser enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.

  Here is the HTML file content:

  Display

  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?

  A. Replace line 04 with console.log(input .value);

  B. Replace line 03 with const input = document.getElementByName(`input');

  C. Replace line 02 with button.addEventListener("onclick", function() {

  D. Replace line 02 with button.addCallback("click", function() {

  Correct Answer: A

• Question 184:

  Refer to code below:

  Function muFunction(reassign){

  Let x = 1;

  var y = 1;

  if( reassign ) {

  Let x= 2;

  Var y = 2;

  console.log(x);

  console.log(y);}

  console.log(x);

  console.log(y);}

  What is displayed when my Function(true) is called?

  A. 2 21 1

  B. 2 2 undefined undefined

  C. 2 2 1 2

  D. 2 2 2 2

  Correct Answer: C

• Question 185:

  A developer has an Error Handler module that contains multiple functions. What kind of export be leverages so that multiple functions can be used?

  A. Named

  B. All

  C. Multi

  D. Default

  Correct Answer: A

• Question 186:

  Refer to the code below:

  01 const exec = (item, delay) =>{

  02 newPromise(resolve => setTimeout( () => resolve(item), delay)),

  03 async function runParallel() {

  04 Const (result1, result2, result3) = await Promise.all{ 05 [exec (`x', `100') , exec(`y', 500), exec(`z', `100')]

  06 );

  07 return `parallel is done: $(result1)$(result2)$(result3)`;

  08 }

  }

  }

  Which two statements correctly execute the runParallel () function?

  Choose 2 answers

  A. Async runParallel () .then(data);

  B. runParallel ( ). done(function(data){ return data; });

  C. runParallel () .then(data);

  D. runParallel () .then(function(data) return data

  Correct Answer: BD

• Question 187:

  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

  Correct Answer: B

• Question 188:

  At Universal Containers, every team has its own way of copyingJavaScript objects. The code

  Snippet shows an implementation from one team:

  Function Person() {

  this.firstName = "John";

  this.lastName = `Doe';

  This.name =() => (

  console.log(`Hello $(this.firstName) $(this.firstName)');

  )}

  Const john = new Person ();

  Const dan = JSON.parse(JSON.stringify(john));

  dan.firstName ='Dan';

  dan.name();

  What is the Output of the code execution?

  A. Hello Dan Doe

  B. Hello John DOe

  C. TypeError: dan.name is not a function

  D. TypeError: Assignment to constant variable.

  Correct Answer: C

• Question 189:

  Given the following code: What will be the first four numbers logged?

  

  A. 0012

  B. 0112

  C. 0122

  D. 0123

  Correct Answer: B

• Question 190:

  The developerwants to test the array shown:

  const arr = Array(5).fill(0)

  Which two tests are the most accurate for this array?

  Choose 2 answers:

  A. console.assert( arr.length === 5 );

  B. arr.forEach(elem => console.assert(elem === 0)) ;

  C. console.assert(arr[0] === 0andand arr[ arr.length] === 0);

  D. console.assert (arr.length >0);

  Correct Answer: AB