Salesforce Salesforce Certifications JAVASCRIPT-DEVELOPER-I Questions & Answers

• Question 141:

  Which three statements are true about promises ? Choose 3 answers

  A. The executor of a new Promise runs automatically.

  B. A Promise has a .then() method.

  C. A fulfilled or rejected promise will not change states .

  D. A settled promise can become resolved.

  E. A pending promise can become fulfilled, settled, or rejected.

  Correct Answer: BCE

• Question 142:

  Developer wants to use a module named universalContainersLiband them call functions from it.

  How should a developer import every function from the module and then call the functions foo and bar ?

  A. import * ad lib from `/path/universalContainersLib.js'; lib.foo(); lib.bar();

  B. import (foo, bar) from `/path/universalContainersLib.js'; foo(); bar();

  C. import all from `/path/universalContaineraLib.js'; universalContainersLib.foo(); universalContainersLib.bar();

  D. import * from `/path/universalContaineraLib.js'; universalContainersLib.foo(); universalContainersLib.bar();

  Correct Answer: A

• Question 143:

  Which statement phrases successfully?

  A. JSON.parse ( ` foo ' );

  B. JSON.parse ( " foo " );

  C. JSON.parse( " ` foo ' " );

  D. JSON.parse(` " foo " ');

  Correct Answer: D

• Question 144:

  Given the JavaScript below:

  

  Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'

  A. 'yellow' : null

  B. null : 'yellow'

  C. 'none1 : "yellow'

  D. 'yellow : 'none'

  Correct Answer: D

• Question 145:

  Refer to the code below:

  const addBy = ?

  const addByEight =addBy(8);

  const sum = addBYEight(50);

  Which two functions can replace line 01 and return 58 to sum?

  Choose 2 answers

  A. const addBy = function(num1){ return function(num2){ return num1 + num2; }

  B. const addBy = function(num1){ return num1 + num2; }

  C. const addBy = (num1) => num1 + num2 ;

  D. const addBY = (num1) => (num2) => num1 + num2;

  Correct Answer: AD

• Question 146:

  A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:

  Class Item {

  constructor(name, price) {

  ... // Constructor Implementation

  }

  }

  Class SaleItem extends Item {

  constructor (name, price, discount) {

  ...//Constructor Implementation

  }

  }

  There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.

  Let regItem =new Item(`Scarf', 55);

  LetsaleItem = new SaleItem(`Shirt' 80, -1);

  Item.prototype.description = function () { return `This is a ' + this.name;

  console.log(regItem.description());

  console.log(saleItem.description());

  SaleItem.prototype.description = function () { return `This is adiscounted ' + this.name; }

  console.log(regItem.description());

  console.log(saleItem.description());

  What is the output when executing the code above ?

  A. This is a Scarf Uncaught TypeError: saleItem.description is not a function This is aScarf This is a discounted Shirt

  B. This is a Scarf This is a Shirt This is a Scarf This is a discounted Shirt

  C. This is a Scarf This is a Shirt This is a discounted Scarf This is a discounted Shirt

  D. This is aScarf Uncaught TypeError: saleItem.description is not afunction This is a Shirt This is a did counted Shirt

  Correct Answer: B

• Question 147:

  Given the following code:

  

  is the output of line 02?

  A. ''x''

  B. ''null'''

  C. ''object''

  D. ''undefined''

  Correct Answer: C

• Question 148:

  Refer tothe following code that imports a module named utils:

  import (foo, bar) from `/path/Utils.js';

  foo() ;

  bar() ;

  Which two implementations of Utils.js export foo and bar such that the code above runs without error?

  Choose 2 answers

  A. // FooUtils.js and BarUtils.js exist Import (foo) from `/path/FooUtils.js'; Import (boo) from ` /path/NarUtils.js';

  B. const foo = () => { return `foo' ; } const bar = () => { return `bar' ; } export { bar, foo }

  C. Export default class { foo() { return `foo' ; } bar() { return`bar' ; } }

  D. const foo = () => { return `foo';} const bar = () => {return `bar'; } Export default foo, bar;

  Correct Answer: BC

• Question 149:

  Given HTML below:

  Universal Container

  Applied Shipping

  Burlington Textiles

  Which statement adds the priority = account CSS class to the universal Containers row?

  A. Document .querySelector(`#row-uc').classes.push(`priority-account');

  B. Document .queryElementById(`row-uc').addclass(`priority-account');

  C. Document .querySelector(`#row-uc').classList.add(`priority-account');

  D. Document .querySelectorALL(`#row-uc').classList.add(`priority-account');

  Correct Answer: B

• Question 150:

  myArraym canhave one level, two levels, or more levels. Which statement flattens myArray when it can be arbitrarily nested?

  A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

  B. myArray. join (","). split (",");

  C. [ ] .concat {. . .myArray) ;

  D. myArray.flat(Infinity);

  Correct Answer: A