Dumpscafe Salesforce-JavaScript-Developer-I

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Question #:1

Given the following code, what is the value of x?

let x = ‘15' + (10 * 2); 35 50 1520 3020

Answer: C

Question #:2

A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.

01 function logStatus(status){

02 console./*Answer goes here*/{‘Item status is: %s’, status};

03 }

Which three console logging methods allow the use of string substitution in line 02?

Assert Log Message Info Error

Answer: B D E

Question #:3

Which three options show valid methods for creating a fat arrow function?

Choose 3 answers

x => ( console.log(‘ executed ’) ; )

[ ] => ( console.log(‘ executed ’) ;)

( ) => ( console.log(‘ executed ’) ;)

X,y,z => ( console.log(‘ executed ’) ;)

(x,y,z) => ( console.log(‘ executed ’) ;)

Answer: A E

Question #:4

Refer to the code below:

Let str = ‘javascript’;

Str[0] = ‘J’; Str[4] = ’S’;

After changing the string index values, the value of str is ‘javascript’. What is the reason for this value:

Non-primitive values are mutable.

Non-primitive values are immutable.

Primitive values are mutable.

Primitive values are immutable.

Answer: D

Question #:5

Refer to the code below: new Promise((resolve, reject) => { const fraction = Math.random(); if( fraction >0.5) reject("fraction > 0.5, " + fraction); resolve(fraction); }) .then(() =>console.log("resolved"))

.catch((error) => console.error(error))

.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

When rejected

When resolved and settled

When resolved

When resolved or rejected

Answer: D

Question #:6

A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.

Which global variable can be used in the script?

window.location

_filename

_dirname

this.path

Answer: B

Question #:7

Refer to the following array:

Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

Let arr2 = arr1.slice(0, 5);

Let arr2 = Array.from(arr1);

Let arr2 = arr1;

D.

Let arr2 = arr1.sort();

Answer: A B

Question #:8

Refer to the code snippet:

Function getAvailabilityMessage(item) {

If (getAvailability(item)){

Var msg =”Username available”; } Return msg; }

A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.

What is the return value of msg hen getAvailabilityMessage (“newUserName” ) is executed and getAvailability(“newUserName”) returns false?

“Username available”

“newUserName”

“Msg is not defined”

undefined

Answer: D

Question #:9

A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:

Import printPrice from ‘/path/PricePrettyPrint.js’;

Based on the code, what must be true about the printPrice function of the PricePrettyPrint module for this import to work ?

printPrice must be be a named export

printPrice must be an all export

printPrice must be the default export

printPrice must be a multi exportc

Answer: C

Question #:10

Which javascript methods can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?

B. C. D. A. B. C.

D.

JSON.stringify and JSON.parse

JSON.serialize and JSON.deserialize

JSON.encode and JSON.decode

JSON.parse and JSON.deserialize

Answer: A

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