Get Ready with JavaScript-Developer-I Exam Dumps (2023)
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NEW QUESTION 43
Refer to the code snippet:
A developer writes this code to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
What is the return of msg when getivelibilityMessage ('' bewUserName') is executed and getAvailability (''newUserName'') returns false?
- A. undefined
- B. ''msg is not defined''
- C. ''Username available''
- D. ''newUsername''
Answer: A
NEW QUESTION 44
Given the following code:
is the output of line 02?
- A. ''null'''
- B. ''x''
- C. ''undefined''
- D. ''object''
Answer: D
NEW QUESTION 45
A developer is wondering whether to use, Promise.then or Promise.catch, especially
when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?
- A. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error =>
console.error(error)) ; - B. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
- C. Promise.reject('cool error here').catch(error => console.error(error));
- D. Promise.reject('cool error here').then(error => console.error(error));
Answer: A,C
NEW QUESTION 46
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} is making a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?
Answer:
Explanation:
Puppy is barking
NEW QUESTION 47
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?
- A. Log
- B. Error
- C. Info
- D. Assert
- E. Message
Answer: A,C,D
NEW QUESTION 48
Refer to the code below:
In which sequence will the number be logged?
- A. 0 2 4 3 1
- B. 0 2 4 1 3
- C. 0 1 2 3 4
- D. 1 3 0 2 4
Answer: A
NEW QUESTION 49
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?
- A. Let numberValue = textValue. Tointeger ( ) ;
- B. Let numberValue = (Number) textvalue;
- C. Let numberValue = Number(textvalue);
- D. Let numberValue = Integer ( textValue );
Answer: C
NEW QUESTION 50
developer removes the HTML class attribute from the checkout button, so now it is
simply:
<button>Checkout</button>.
There is a test to verify the existence of the checkout button, however it looks for a button with
class= "blue". The test fails because no such button is found.
Which type of test category describes this test?
- A. True negative
- B. False negative
- C. True positive
- D. False positive
Answer: B
NEW QUESTION 51
Given the following code:
What will be the first four numbers logged?
- A. 0123
- B. 0012
- C. 0122
- D. 0112
Answer: C
NEW QUESTION 52
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
- A. sampleText.includes(' quick ') !== -1;
- B. sampleText.includes(' Fox ', 3)
- C. sampleText.includes('fox');
- D. sampleText.includes(' quick ', 4);
- E. sampleText.includes(' fox ');
Answer: A,D,E
NEW QUESTION 53
Which statement phrases successfully?
- A. JSON.parse( " ' foo ' " );
- B. JSON.parse(' " foo " ');
- C. JSON.parse ( " foo " );
- D. JSON.parse ( ' foo ' );
Answer: B
NEW QUESTION 54
Given the requirement to refactor the code above to JavaScript class format, which class
definition is correct?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option B
- D. Option A
Answer: D
NEW QUESTION 55
Refer to the following code block:
What is the console output?
- A. > Uncaught Reference Error
- B. > Better student Jackie got 100% on test.
- C. > Jackie got 70% on test.
- D. > Better student Jackie got 70% on test.
Answer: B
NEW QUESTION 56
Refer to the code:
Given the code above, which three properties are set for pet1? Choose 3 answers
- A. canTalk
- B. name
- C. owner
- D. type
- E. size
Answer: A,D,E
NEW QUESTION 57
Refer to the following 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. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar; - B. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js'; - C. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
} - D. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo }
Answer: C,D
NEW QUESTION 58
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.slice(2,3);
- B. Let x= arr.filter((a) => ( return a>2 ));
- C. Let x= arr.splice(2,3);
- D. Let x= arr.filter (( a) => (a<2));
- E. Let x= arr.slice(2);
Answer: B,C,E
NEW QUESTION 59
Refer to the code below:
What is the output of this function when called with an empty array?
- A. Return Infinity
- B. Return 5
- C. Return NaN
- D. Return 0
Answer: B
NEW QUESTION 60
Refer to the code below:
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 61
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A.
- B.
- C.
- D.
Answer: D
NEW QUESTION 62
Refer to the following code block:
What is the console output?
- A. > Uncaught Reference Error
- B. > Better student Jackie got 100% on test.
- C. > Better student Jackie got 70% on test.
- D. > Jackie got 70% on test.
Answer: C
NEW QUESTION 63
Refer to the code below:
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 64
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. Both lines 08 and 09 are executed, but values outputted are undefined.
- C. Line 08 thrones an error, therefore line 09 is never executed.
- D. Line 08 outputs the variable, but line 09 throws an error.
Answer: D
NEW QUESTION 65
A developer removes the HTML class attributes from the check button, so now it is simply:
<button>checkout<button>.
There is a test verify the existence of the checkout button, however it look for a button with class'' blue''. The test fails because no such button is f.
Which type of test category describes this test?
- A. True positive
- B. True negative
- C. False negative
- D. False positive
Answer: A
NEW QUESTION 66
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