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copyright Certified JavaScript Developer I Exam Sample Questions (Q150-Q155):

NEW QUESTION # 150
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
● Will establish a web socket connection and handle receipt of messages to the server
● Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
D. try{
ws.connect (( ) => {
console.log('connected to client'); });

Answer: C

Explanation:
} catch(error) { console.log('ERROR' , error); };
}

NEW QUESTION # 151
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 # 152
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "[email protected]",
04 "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: A,C

NEW QUESTION # 153
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.alice (2) ;
B. Let x = arr.filter( (a) => ( a < 2)) ;
C. Let x = arr.filter( (a) => )return a > 2 )) ;
D. Let x = arr. Slince (2, 3);
E. Let x = arr.aplice (2, 3);

Answer: A,C,E

NEW QUESTION # 154
Refer to the code below:

What is result of the code block?

A. The console logs flag' and then an error is thrown.
B. An error is thrown.
C. The console logs only 'flag',
D. The console logs 'flag' and another flag',

Answer: A

NEW QUESTION # 155
......

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Unparalleled Test JavaScript-Developer-I Result, Pass4sure JavaScript-Developer-I Exam Prep

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Authoritative Test JavaScript-Developer-I Result & Leading Provider in Qualification Exams & Realistic Pass4sure JavaScript-Developer-I Exam Prep

copyright Certified JavaScript Developer I Exam Sample Questions (Q150-Q155):

High-quality Test JavaScript-Developer-I Result Offer You The Best Pass4sure Exam Prep | copyright Certified JavaScript Developer I Exam

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