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NEW QUESTION # 42
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?
- A. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum - B. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum - C. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum - D. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum
Answer: C
NEW QUESTION # 43
Which option is true about the strict mode in imported modules?
- A. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.
- B. You can only reference notStrict() functions from the imported module.
- C. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.
- D. Imported modules are in strict mode whether you declare them as such or not.
Answer: B
NEW QUESTION # 44
Which two code snippets show working examples of a recursive function?
Choose 2 answers
- A. Const sumToTen = numVar => {
If (numVar < 0)
Return;
return sumToTen(numVar + 1)}; - B. Function factorial ( numVar ) {
If (numVar < 0) return;
If ( numVar === 0 ) return 1;
return numVar -1; - C. Let countingDown = function(startNumber) {
If ( startNumber >0) {
console.log(startNumber) ;
return countingDown(startNUmber);
} else {
return startNumber;
}}; - D. Const factorial =numVar => {
If (numVar < 0) return;
If ( numVar === 0 ) return 1;
return numVar * factorial ( numVar - 1 );
};
Answer: C,D
NEW QUESTION # 45
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the result after line 10 executes?
- A. Error: myFather.job is not a function
- B. John Developer
- C. John undefined
- D. Undefined Developer
Answer: B
NEW QUESTION # 46
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null
- A. 0
- B. 1
- C. '4100null'
- D. '3100null'
Answer: C
NEW QUESTION # 47
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing " Tony" to "Mr. T."?
- A. document.querySelector('$main li.Tony').innerHTML = ' Mr. T. ';
- B. document.querySelectorAll('$main $TONY').innerHTML = ' Mr. T. ';
- C. document.querySelector('$main li:nth-child(2)'),innerHTML = ' Mr. T. ';
- D. document.querySelector('$main li:second-child').innerHTML = ' Mr. T. ';
Answer: C
NEW QUESTION # 48
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?
- A. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum - B. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum - C. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum - D. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum
Answer: C
NEW QUESTION # 49
Given the HTML below:
Which statement adds the priority-account css class to the Applied Shipping row?
- A. document.querySelector('#row-as').classList.add('priority-account');
Answer: A
NEW QUESTION # 50
Which two options are core Node.js modules?
Choose 2 answers
- A. worker
- B. isotream
- C. http
- D. exception
Answer: B,C
NEW QUESTION # 51
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 A
- C. Option C
- D. Option D
Answer: B
NEW QUESTION # 52
Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers
- A. Cookies
- B. Global variables
- C. localStorage.
- D. indexedDB
- E. IIFEs
Answer: C,D,E
NEW QUESTION # 53
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirement?
- A. deliveryDate.date = new Date(+9) ;
- B. deliveryDate.setDate(( new Date ( )).getDate () +9);
- C. deliveryDate.setDate( Date.current () + 9);
- D. deliveryDate.date = Date.current () + 9;
Answer: B
NEW QUESTION # 54
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?
- A. document.getElementById(' card-01 ').getBoundingClientRest().width
- B. document.getElementById(' card-01 ').style.width
- C. document.getElementById(' card-01 ').width
- D. document.getElementById(' card-01 ').innerHTML.lenght*e
Answer: A
NEW QUESTION # 55
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done make this code work as expected?
- A. Replace line 02 with button.addCallback("click", function() {
- B. Replace line 04 with console.log(input .value);
- C. Replace line 03 with const input = document.getElementByName('input');
- D. Replace line 02 with button.addEventListener("onclick", function() {
Answer: B
NEW QUESTION # 56
Refer to code below:
Let first = 'who';
Let second = 'what';
Try{
Try{
Throw new error('Sad trombone');
}catch (err){
First ='Why';
}finally {
Second ='when';
} catch (err) {
Second ='Where';
}
What are the values for first and second once the code executes ?
- A. First is Who and second is When
- B. First is who and second is where
- C. First is why and second is when
- D. First is why and second is where
Answer: C
NEW QUESTION # 57
Refer to the code below:
Function changeValue(obj) {
Obj.value = obj.value/2;
}
Const objA = (value: 10);
Const objB = objA;
changeValue(objB);
Const result = objA.value;
What is the value of result after the code executes?
- A. Undefined
- B. 0
- C. 1
- D. Nan
Answer: C
NEW QUESTION # 58
Refer to the following code:
What is the value of output on line 11?
- A. [''foo'', ''bar'']
- B. [''foo'':1, ''bar'':2'']
- C. [1, 2]
- D. An error will occur due to the incorrect usage of the for...of statement on line 07.
Answer: D
NEW QUESTION # 59
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers
- A. The tester should dear their browser cache.
- B. The tester should disable their browser cache.
- C. The developer should inspect their browser refresh settings.
- D. The developer should rework the code.
Answer: A,C
NEW QUESTION # 60
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. Promise.reject('cool error here').catch(error => console.error(error));
- B. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
- C. Promise.reject('cool error here').then(error => console.error(error));
- D. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
Answer: A,B
NEW QUESTION # 61
A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js Without using any third-party libraries, what should the developer add to index.js to create the secure web server?
- A. const tls = require('tls');
- B. const server =require('secure-server');
- C. const http =require('http');
- D. const https =require('https');
Answer: D
NEW QUESTION # 62
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. try{
ws.connect (( ) => {
console.log('connected to client'); });
} catch(error) { console.log('ERROR' , error); };
} - C. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
}); - D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
Answer: D
NEW QUESTION # 63
Refer to the code below:
function foo () {
const a =2;
function bat() {
console.log(a);
}
return bar;
}
Why does the function bar have access to variable a ?
- A. Hoisting
- B. Outer function's scope
- C. Inner function's scope
- D. Prototype chain
Answer: B
NEW QUESTION # 64
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 0
- D. Return NaN
Answer: B
NEW QUESTION # 65
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