Free Salesforce Javascript Developer I Exam Dumps and Javascript Developer I Exam Questions

Question No: 11

MultipleChoice

Which code statement below correctly persists an object in localStorage?

Options

Aconst setLocalstorage = (storageKey , jsobject) => (
windows. LocalStorage,setitem(storagekey. jSON,string
)

Bconst setLocalstorage = (jsobject) =>
Windows.localstorage.connectobject(jsObject);
C.
Const setLocalstorage = (jsobject ) => (
Window .localstorage .setitem (jsobject) ;
D.
Const setlocalstorage = (storagekey, jsObject) => (
Window. Localstorage.persist (storagekey, jsObject);
)

Question No: 12

MultipleChoice

The developer wants to test the array shown:

Const arr = Array (5) . fill (0);

Which two test are the most accurate for this array? Choose 2 answers

Options

AConsole,assert(arr.length === 5) ;

BArr. forEach (elem => console .assert (elem === 0) );

CConsole,assert(arr(0) === 0 $$ arr (arr .longth ) === 0) ;

DConsole. Assert (arr. Length > 0) ;

Question No: 13

MultipleChoice

A developer receives a comment from the Tech lead that the code below gives an error.

Which line edit should be made to make this code run?

Options

A01 let monthname = 'July ';

B02 let year = 2019 ;

C02 const year = 2020;

D03 if (year == 2019) (

Question No: 14

MultipleChoice

Refer to the following code:

What will the console when the button is clicked?

Options

AOuter message

BOuter message

CInner message

DInner message

Question No: 15

MultipleChoice

Refer to the code below:

Why does the function bar have access to variable =?

Options

AInner function's scope

BHoisting

COuter function's scope

DPrototype chain

Question No: 16

MultipleChoice

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

Options

AWindow.history,state,push.(newStateObject);

BWindow.history,state,push.(newStateObject, ' ' null;

CWindow.history,pushState.(newStateObject, ' ', null)) ;

DWindow.history,pushState.(newStateObject);

Question No: 17

MultipleChoice

Universal containers (UC) just launched a new landing page, but users complain that the website is slow, A developer found some functions that cause this problem, To verify this, the developer decides to execute everything and log the time each of these suspicious function consumes.

Which function can then developer use to obtain the time spent by every one of the three functions?

Options

AConsole.timeLog ( )

BConsole.getTime ( )

CConsole,trace ( )

DConsole, timestamp

Question No: 18

MultipleChoice

Refer to the code below:

What is the output after the ode executes successfully?

A.

End

Start

Success

Options

BStart
Success
End
C.
Start
End
Success
D.
Success
Start
End

Question No: 19

MultipleChoice

Refer to the HTML below:

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

Options

ADocuments.getElementById( 'card-01') .getBoundingClientRect () .width

BDocuments.getElementById( 'card-01') . style,width

CDocuments.getElementById( 'card-01') . width

DDocuments.getElementById( 'card-01') . InnerHTML. Length.6

Question No: 20

MultipleChoice

A developer is trying to convince management that their team will benefit from using Node.JS for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.

Which three benefits of Node.js can the developer use to persuade their manager?

Options

AInstalls with its own package manager to install and manage third-party libraries.

BEnsure stability with one major release every few years.

CPerforms a static analysis can code before execution to look for runtime errors.

DExecutes server-side JavaScript code to avoid learning a new language.

EUses non-blocking functionality for performant request handling