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

Salesforce JAVASCRIPT-DEVELOPER-I Online Questions & Answers

• Question 121:

  Refer of the string below:

  Const str = `sa;esforce'=;

  Which two statement result in the word 'Sale'?

  Choose 2 answers

  A. str, substring (0,5) ;
  B. str, substr(0,5) ;
  C. str, substring(1,5);
  D. str, substr(1,5) ;
  A. str, substring (0,5) ;
  B. str, substr(0,5) ;

• Question 122:

  A developer wants to define a function log to be used a few times on a single-file JavaScript script.

  01 // Line 1 replacement

  02 console.log('"LOG:', logInput);

  03 }

  Which two options can correctly replace line 01 and declare the function for use? Choose 2 answers

  A. function leg(logInput) {
  B. const log(loginInput) {
  C. const log = (logInput) => {
  D. function log = (logInput) {
  A. function leg(logInput) {
  C. const log = (logInput) => {

• Question 123:

  Refer to the following array:

  Let arr = [1, 2, 3, 4, 5];

  Which three options result in x evaluating as [1, 2]?

  Choose 3 answer

  A. let x = arr. slice (2);
  B. let x = arr. slice (0, 2);
  C. let x arr.filter((a) => (return a
  D. let x = arr.filter ((a) => 2 }) ;
  E. let x =arr.splice(0, 2);
  B. let x = arr. slice (0, 2);
  C. let x arr.filter((a) => (return a
  E. let x =arr.splice(0, 2);

• Question 124:

  Given the following code:

  Let x =null;

  console.log(typeof x);

  What is the output of the line 02?

  A. "Null"
  B. "X"
  C. "Object"
  D. "undefined"
  C. "Object"

• Question 125:

  Refer to the code below:

  Const myFunction = arr => {

  Return arr.reduce((result, current) =>{

  Return result = current;

  }, 10};

  }

  What is the output of this function when called with an empty array ?

  A. Returns 0
  B. Throws an error
  C. Returns 10
  D. Returns NaN
  D. Returns NaN

• Question 126:

  Refer to the code below:

  Let textValue = '1984';

  Which code assignment shows a correct way to convert this string to an integer?

  A. let numberValue = Number(textValue);
  B. Let numberValue = (Number)textValue;
  C. Let numberValue = textValue.toInteger();
  D. Let numberValue = Integer(textValue);
  A. let numberValue = Number(textValue);

• Question 127:

  A team that works on a big project uses npm to deal with projects dependencies.

  A developer added a dependency does not get downloaded when they executenpminstall.

  Which two reasons could be possible explanations for this?

  Choose 2 answers

  A. The developer missed the option --add when adding the dependency.
  B. The developer added the dependency as a dev dependency, and NODE_ENV Is set to production.
  C. The developer missed the option --save when adding the dependency.
  D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
  B. The developer added the dependency as a dev dependency, and NODE_ENV Is set to production.
  C. The developer missed the option --save when adding the dependency.
  D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

• Question 128:

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

• Question 129:

  Which code statement below correctly persists an objects in local Storage ?

  A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject)); }
  B. const setLocalStorage = ( jsObject) => {window.localStorage.connectObject(jsObject));}
  C. const setLocalStorage = ( jsObject) => {window.localStorage.setItem(jsObject);}
  D. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject); }
  A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject)); }

• Question 130:

  A developer has two ways to write a function:

  Option A:

  function Monster(){

  this.growl = ()=>{

  console.log('Grr!');

  }

  }

  Option B:

  function Monster(){};

  Monster.prototype.growl = ()=>{

  console.log('Grr!');

  }

  After deciding on an option, the developercreates 1000 monster objects.

  How many growl methods are created with Option A and Option B?

  A. 1000 for Option A, 1 for Option B
  B. 1 methods for both
  C. 1000 for both
  D. 1 for Option A, 1000 for Option B
  B. 1 methods for both