Apr 09, 2024 Detailed New JavaScript-Developer-I Exam Questions for Concept Clearance [Q61-Q82]

Apr 09, 2024 Detailed New JavaScript-Developer-I Exam Questions for Concept Clearance

JavaScript-Developer-I Exam Preparation Material with New JavaScript-Developer-I Dumps Questions.

NEW QUESTION # 61
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?
Choose 3 answers:

A. User non blocking functionality for performant request handling .
B. Ensures stability with one major release every few years.
C. I nstalls with its own package manager to install and manage third-party libraries.
D. Performs a static analysis on code before execution to look for runtime errors.
E. Executes server-side JavaScript code to avoid learning a new language.

Answer: A,C,D

NEW QUESTION # 62
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon,
starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

A. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');
B. productSKU = productSKU .padEnd (16. '0').padstart('sku');
C. productSKU = productSKU .padStart (19. '0').padstart('sku');
D. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');

Answer: D

NEW QUESTION # 63
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A)

B)

C)

D)

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

Answer: C

NEW QUESTION # 64
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK' ;
Throw new Error('not OK');
)
Which assertion accurately tests the above code?

A. Console.assert (await functionUnderTest(true), 'OK')
B. Console.assert (await functionUnderTest(true), ' OK ')
C. Console.assert (await functionUnderTest(true), ' not OK ')
D. Console.assert (await functionUnderTest(true), ' not OK ')

Answer: A

NEW QUESTION # 65
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

A. Undefined
B. Line 13 throws an error.
C. 'Undefined values!'
D. 'Null value!'

Answer: C

NEW QUESTION # 66
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A. > true > false
B. > 5 >undefined
C. > 5 > 0
D. > 5 > -1

Answer: B

Explanation:

NEW QUESTION # 67
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers

A. Let arr2 = arr1 .slice (0, 5);
B. Let arr2 = arr1;
C. Let arr2 = Array. From (arr1) ;
D. Let arr2 = arr1 sort ();

Answer: B,D

NEW QUESTION # 68
Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,"Car1 crashed in")); let car2 = new Promise(resolve => setTimeout(resolve,1500,"Car2 completed")); let car3 = new Promise(resolve => setTimeout(resolve,3000,"Car3 completed")); Promise.race([car1,car2,car3])
.then(value=>{
let result = `${value} the race.`;
}).catch(err=>{
console.log('Race is cancelled.',err);
});
What is the value of result when promise.race execues?

Answer:

Explanation:
Car2 completed the race.

NEW QUESTION # 69
Refer to the following object.

How can a developer access the fullName property for dog?

A. Dog.fullName ( )
B. Dog.fullName
C. Dog, get, fullName
D. Dog, function, fullName

Answer: B

NEW QUESTION # 70
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Name
B. Size
C. Type
D. canTalk
E. Owner

Answer: B,C,D

NEW QUESTION # 71
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)

B)

C)

D)

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

Answer: B

NEW QUESTION # 72
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

A. Line 13 throws an error.
B. 'Undefined values!'
C. Undefined
D. 'Null value!'

Answer: C

NEW QUESTION # 73
Given the following code:
Let x = ('15' +10) +2;
What is the value of x?

A. 0
B. 1
C. 2
D. 3

Answer: B

NEW QUESTION # 74
A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName = 'June';
}
Which line edit should be made to make this code run?

A. 01 let monthName ='July';
B. 03 if (year == 2019) {
C. 02 let year =2019;
D. 02 const year = 2020;

Answer: A

NEW QUESTION # 75
Refer to the code below:

Which value can a developer expect when referencing country,capital,cityString?

A. An error
B. 'NaN'
C. undefined
D. 'London'

Answer: B

NEW QUESTION # 76
Which option is a core Node;js module?

A. Memory
B. Path
C. Ios
D. locale

Answer: B,C

NEW QUESTION # 77
Refer to the code below:

What value can a developer expect when referencing o,js,secondCity?

A. Undefined
B. An error
C. 'New York
D. 'new york'

Answer: D

NEW QUESTION # 78
Refer to thefollowing code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

A. // FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from '
/path/NarUtils.js';
B. Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}
C. const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }
D. const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;

Answer: B,C

NEW QUESTION # 79
A test has a dependency on database .query. During the test the dependency is replace with an called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?