NEW QUESTION 1
Which statement accurately describes the behaviour of the async/ await keyworks ?

• A. The associated class contains some asynchronous functions.
• B. The associated function will always return apromise
• C. The associated function can only be called via asynchronous methods
• D. The associated sometimes returns a promise.

Answer: B

NEW QUESTION 2
Which code statement correctly retrieves and returns an object from localStorage?

• A. const retrieveFromLocalStorage = () =>{return JSON.stringify(window.localStorage.getItem(storageKey));}
• B. const retrieveFromLocalStorage = (storageKey) =>{ return window.localStorage.getItem(storageKey);}
• C. const retrieveFromLocalStorage = (storageKey) =>{ returnJSON.parse(window.localStorage.getItem(storageKey));}
• D. const retrieveFromLocalStorage = (storageKey) =>{ return window.localStorage[storageKey];}

Answer: C

NEW QUESTION 3
Which three options show valid methods for creating a fat arrowfunction? Choose 3 answers

• A. x => ( console.log(‘ executed ’) ; )
• B. [ ] => ( console.log(‘ executed ’) ;)
• C. ( ) => ( console.log(‘ executed ’) ;)
• D. X,y,z => ( console.log(‘ executed ’) ;)
• E. (x,y,z) => ( console.log(‘ executed ’) ;)

Answer: AE

NEW QUESTION 4
A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the
function to run once after five seconds.
What is the correct syntax to schedule this function?

• A. setTimeout (formatName(), 5000, "John", "BDoe");
• B. setTimeout (formatName('John', ‘'Doe'), 5000);
• C. setTimout(() => { formatName("John', 'Doe') }, 5000);
• D. setTimeout ('formatName', 5000, 'John", "Doe');

Answer: D

NEW QUESTION 5
A developer writers the code below to calculate the factorial of a given number.

What isthe result of executing line 04?

• A. 6
• B. -Infinity
• C. RuntimeError

Answer: D

Explanation:

NEW QUESTION 6
Which option is a core Node,js module?

• A. Path
• B. Ios
• C. Memory
• D. locate

Answer: A

NEW QUESTION 7
Refer to following code block:
Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];
Let output =0;
For (let num of array){ if (output >0){
Break;
}
if(num % 2 == 0){
Continue;
}
Output +=num;
What is the value of output after the code executes?

• A. 16
• B. 36
• C. 11
• D. 25

Answer: A

NEW QUESTION 8
Refer to code below:

What is the value of the result after line 10 executes?

• A. Error: myFather.job is not a function
• B. Undefined Developer
• C. John undefined
• D. John Developer

Answer: D

NEW QUESTION 9
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum; Which two tests are most accurate for this code? Choose 2 answers

• A. console.assert(toNumber(‘2’) ===2);
• B. console.assert(Number.isNaN(toNumber()));
• C. console.assert(toNumber(‘-3’) < 0);
• D. console.assert(toNumber () === NaN);

Answer: AC

NEW QUESTION 10
Refer to the following code: 01 function Tiger(){
02 this.Type = ‘Cat’; 03 this.size = ‘large’; 04 }
05
06 let tony = new Tiger(); 07 tony.roar = () =>{
8 console.log(‘They\’re great1’);
9 };
10
11 function Lion(){ 12 this.type = ‘Cat’; 13this.size = ‘large’; 14 }
15
16 let leo = new Lion(); 17 //Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable the function call on line 18? Choose 2 answers.

• A. Leo.roar = () => { console.log(‘They\’re pretty good:’); };
• B. Object.assign(leo,Tiger);
• C. Object.assign(leo,tony);
• D. Leo.prototype.roar = () => { console.log(‘They\’re pretty good:’); };

Answer: AC

NEW QUESTION 11
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) {

Answer: AC

NEW QUESTION 12
A developer uses a parsed JSON string to work with userinformation as in the block below:
01 const userInformation ={
02 “ id ” : “user-01”,
3 “email” : “user01@universalcontainers.demo”,
4 “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)

Answer: AC

NEW QUESTION 13
Why would a developer specify a package.jason as a developed forge instead of a dependency ?

• A. It is required by the application in production.
• B. It is only needed for local development and testing.
• C. Other requiredpackages depend on it for development.
• D. It should be bundled when the package is published.

Answer: B

NEW QUESTION 14
A developer implements a function that adds a few values.

Which three options can the developer invoke for this function to get a return value of 10 ? Choose 3 answers

• A. Sum () (20)
• B. Sum (5, 5) ()
• C. sum() (5, 5)
• D. sum(5)(5)
• E. sum(10) ()

Answer: CD

NEW QUESTION 15
Given code below: setTimeout (() => ( console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > ( setTimeout(() => ( reject(console.log(3));
). 1000);
)).catch(() => ( console.log(4);
));
console.log(5);
What is logged to the console?

• A. 2 1 4 3 5
• B. 2 5 13 4
• C. 1 2 4 3 5
• D. 1 2 5 3 4

Answer: B

NEW QUESTION 16
Refer to the following array: Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ? Choose 3 answers.

• A. Let x= arr.filter (( a) => (a<2));
• B. Let x=arr.splice(2,3);
• C. Let x= arr.slice(2);
• D. Let x= arr.filter((a) => ( return a>2 ));
• E. Let x = arr.slice(2,3);

Answer: BCD

NEW QUESTION 17
A developer is asked to fix some bugs reported by users. Todo that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){ This.maxspeed =masSpeed; This.color = color;
Let carSpeed = document.getElementById(‘ CarSpeed’); Debugger;
Let fourWheels =new Car (carSpeed.value, ‘red’);
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

• A. The values of the carSpeed and fourWheels variables
• B. A variable displaying the number of instances created for theCar Object.
• C. The style, event listeners and other attributes applied to the carSpeed DOM element
• D. The information stored in the window.localStorage property

Answer: CD

NEW QUESTION 18
A developer implements and calls the following code when an application state change occurs: Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ‘ ’, null);
}
If the back button is clicked after this method is executed, what can a developer expect?

• A. A navigate event is fired with a state property that details the previous application state.
• B. The page is navigated away from and the previous page in the browser’s history is loaded.
• C. The page reloads and all Javascript is reinitialized.
• D. A popstate event is fired with a state property that details the application’s last state.

Answer: B

NEW QUESTION 19
A developer is required to write a function that calculates the sum of elements in an
array but is getting undefinedevery time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?

• A. Replace line 02 with return arr.map(( result, current) => (
• B. Replace line 04 with result = result +current;
• C. Replace line 03 with if(arr.length == 0 ) ( return 0; )
• D. Replace line 05 with return result;

Answer: D

NEW QUESTION 20
Refer to the code below:

Why does the function bar have access to variable a ?

• A. Inner function’s scope
• B. Hoisting
• C. Outer function’s scope
• D. Prototype chain

Answer: C

NEW QUESTION 21
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