Salesforce Salesforce Certifications JAVASCRIPT-DEVELOPER-I Questions & Answers

• Question 151:

  A developer uses a parsed JSON string to work with user information as in the block below:

  01 const user Information ={

  02 " id " : "user-01",

  03 "email" : "[email protected]",

  04 "age" : 25

  Which two options access the email attribute in the object?

  Choose 2 answers

  A. userInformation("email")

  B. userInformation.get("email")

  C. userInformation.email

  D. userInformation(email)

  Correct Answer: AC

• Question 152:

  Refer to the following code:

  

  Which statement should be added to line 09 for the code to display 'The boat has a capacity of 10 people?

  A. super.size = size;

  B. ship.size size;

  C. super (size);

  D. this.size = size;

  Correct Answer: D

• Question 153:

  Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code? Choose 3 answers

  A. z is equal to 3.14.

  B. 'use strict' is hoisted, so it has an effect on all lines.

  C. 'use strict' has an effect only on line 05.

  D. 'use strict' has an effectbetween line 04 and the end of the file.

  E. Line 05 throws an error.

  Correct Answer: ACE

• Question 154:

  Given the code below:

  Function myFunction(){

  A =5;

  Var b =1;

  }

  myFunction();

  console.log(a);

  console.log(b);

  What is the expected output?

  A. Both lines 08 and 09 are executed, and the variables are outputted.

  B. Line 08 outputs the variable, but line 09 throws an error.

  C. Line 08 thrones an error, therefore line 09 is never executed.

  D. Both lines 08 and 09 are executed, but values outputted are undefined.

  Correct Answer: B

• Question 155:

  A developer is debugging a web server that uses Node.js The server hits a runtime error every third request to an important endpoint on the web server.

  The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.

  Which command can be run to access DevTools and make sure the breakdown is hit?

  A. node -i index.js

  B. Node --inspect-brk index.js

  C. Node inspect index.js

  D. Node --inspect index.js

  Correct Answer: D

• Question 156:

  A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.

  Const deliveryDate = new Date ();

  Due to changes in the business requirements, the delivery date must now be today's date + 9 days.

  Which code meets thisnew requirement?

  A. deliveryDate.setDate(( new Date ( )).getDate () +9);

  B. deliveryDate.setDate( Date.current () + 9);

  C. deliveryDate.date = new Date(+9) ;

  D. deliveryDate.date = Date.current () + 9;

  Correct Answer: A

• Question 157:

  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);

  Correct Answer: A

• Question 158:

  Refer to HTML below:

  This card is smaller.

  The width and height of this card is determined by its contents.

  Which expression outputs the screen widthof the element with the ID card-01?

  A. document.getElementById(` card-01 ').getBoundingClientRest().width

  B. document.getElementById(` card-01 ').style.width

  C. document.getElementById(` card-01 ').width

  D. document.getElementById(` card-01 ').innerHTML.lenght*e

  Correct Answer: A

• Question 159:

  Which two console logs outputs NaN ?

  Choose 2 answers

  A. console.log(10/ Number(`5'));

  B. console.log(parseInt(`two'));

  C. console.log(10/ `'five);

  D. console.log(10/0);

  Correct Answer: BC

• Question 160:

  What are two unique features of functions defined with a fat arrow as compared to normal function definition? Choose 2 answers

  A. The function generated its own this making it useful for separating the function's scope from itsenclosing scope.

  B. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

  C. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.

  D. The function uses the this from the enclosing scope.

  Correct Answer: AB