[2024年03月15日]JavaScript-Developer-I問題集完全版問題、試験学習ガイド [Q94-Q118]

質問94、 What is the result of the code block?

質問95、 A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?

質問96、 Refer to the code below:
console.log(”start);
Promise.resolve(‘Success’) .then(function(value){
console.log(‘Success’);
});
console.log(‘End’);
What is the output after the code executes successfully?

質問97、 A developer is wondering whether to use, promise, then or provise, catch especially when a promise throws an error.
Which two promises are rejected? Choose 2 answers

質問98、 Refer to the following code:

What is the output of line 11?

質問99、 Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

質問100、 Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers

質問101、 Given the code below:
Const copy = JSON.stringify((new String (‘false’) , new Bolean(false) undefined)); What is the value of copy?

質問102、 Refer to the code below:

What is display when the cod executes?

質問103、 A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:

What is the behavior?

質問104、 Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, “car 1 crashed in” =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, “car 2 completed”)
Let car3 =new Promise(resolve => setTimeout(resolve, 3000, “car 3 completed”)
Promise.race(( car1, car2, car3))
.then (value => (
Let result = ‘$(value) the race.’;)}
.catch(arr => {
console.log(“Race is cancelled.”, err);
});
What is the value of result when Promise.race executes?

質問105、 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 and Option B?

質問106、 Refer to the code below:

Why does the function bar have access to variable =?

質問107、 Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?

質問108、 Refer to the code below:
Let textValue = ‘1984’;
Which code assignment shows a correct way to convert this string to an integer?

質問109、 Refer to the string below:
const str = ‘Salesforce’;
Which two statements result in the word ‘Sales’?
Choose 2 answers

質問110、 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 ?

質問111、 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?

質問112、 The developer has a function that prints “Hello” to an input name. To test this, thedeveloper created a function that returns “World”. However the following snippet does not print ” Hello World”.

What can the developer do to change the code to print “Hello World” ?

質問113、 What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

質問114、 The developer wants to test the array shown:
Const arr = Array (5) . fill (0);
Which two test are the most accurate for this array? Choose 2 answers

質問115、 Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?

質問116、 Refer to the following code:
01 function Tiger(){
02 this.Type = ‘Cat’;
03 this.size = ‘large’;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () =>{
08 console.log(‘They’re great1’);
09 };
10
11 function Lion(){
12 this.type = ‘Cat’;
13 this.size = ‘large’;
14 }
15
16 let leo = new Lion();
17 //Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers.

質問117、 developer has a web server running with Node.js. The command to start the web
server is node server,js. The web server started having latency issues. Instead of a one second
turn around for web requests, the developer now sees a five second turnaround,
Which command can the web developer run to see what the module is doing during the
latency period?

質問118、 Refer to the following code that performs a basic mathematical operation on a provided
input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);