NO.47 Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?

NO.48 is below:
<input type=”file” onchange=”previewFile()”>
<img src=”” height=”200″ alt=”Image Preview…”/>
The JavaScript portion is:
01 function previewFile(){
02 const preview = document.querySelector(‘img’);
03 const file = document.querySelector(‘input[type=file]’).files[0];
04 //line 4 code
05 reader.addEventListener(“load”, () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

NO.49 Which two options are core Node.js modules?
Choose 2 answers

NO.50 Refer to the following code:

NO.51 The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers

NO.52 A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?

NO.53 In which situation should a developer include a try .. catch block around their function call ?

NO.54 A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server, js file will start the server. the developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?

NO.55 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

NO.56 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

NO.57 Which three actions can be using the JavaScript browser console?
Choose 3 answers:

NO.58 Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers

NO.59 A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log(“Page has loaded!”);
}
Where can the developer see the log statement after loading the page in the browser?

NO.60 There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

NO.61 Refer to code below:
Function muFunction(reassign){
Let x = 1;
var y = 1;
if( reassign ) {
Let x= 2;
Var y = 2;
console.log(x);
console.log(y);}
console.log(x);
console.log(y);}
What is displayed when myFunction(true) is called?

NO.62 A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log (“Grr!”);
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log(“Grr!”);
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A Option B?