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NEW QUESTION # 27
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:
What is the output of the code execution?
- A. Hello Dan
- B. Hello John Doe
- C. SyntaxError: Unexpected token in JSON
- D. Hello Dan Doe
Answer: C
NEW QUESTION # 28
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?
- A. node -i server.js
- B. node server,js inspect
- C. node start inspect server,js
- D. node inspect server,js
Answer: D
NEW QUESTION # 29
Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
- A. JSON.parse and JSON deserialize
- B. JSON.Stringify and JSON.parse
- C. JSON,serialize and JSON,desrialize
- D. JSON.encode and JSON decode
Answer: C
NEW QUESTION # 30
Refer to the code below:
What is the output if this function when called with an empty array?
- A. Retruns 0
- B. Return 10
- C. Return NaN
- D. Throws an error
Answer: B
NEW QUESTION # 31
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers
- A. [ ]. concat.apply(inArray, [ ]);
- B. [ ]. concat ( [ ....inArray ]);
- C. []. Concat (... inArray);
- D. [ ]. Concat.apply ([ ], inArray);
Answer: C,D
NEW QUESTION # 32
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not
a reference to arr1?
- A. Let arr2 = arr1;
- B. Let arr2 = arr1.slice(0, 5);
- C. Let arr2 = Array.from(arr1);
- D. Let arr2 = arr1.sort();
Answer: B,C
NEW QUESTION # 33
A developer creates a simple webpage with an input filed. 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:
The developer wrote the JavaScript code below:
When the user clicks the button, the output is always ''hello''.
What needs to be done to make this code work as expected?
- A. Replace line 04 with button.addEventListener (''onclick'', function ( ) (
- B. Replace line 04 with button, addCallback (''click'', function ( ) (
- C. Replace line 04 with console.log (input, value);
- D. Replace line 04 with const input = document. getElementByName ('input') ;
Answer: C
NEW QUESTION # 34
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. Error
- B. Assert
- C. Log
- D. Message
- E. Info
Answer: B,E
NEW QUESTION # 35
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.
What is the value of msg when getAvailableabilityMessage ("newUserName") is executed and get Availability ("newUserName") returns true?
- A. "newUserName"
- B. "User-name available"
- C. "msg is not defined"
- D. undefined
Answer: B
NEW QUESTION # 36
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method,
Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers
- A. White box
- B. Stubbing
- C. Black box
- D. Substitution
Answer: A,D
NEW QUESTION # 37
Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
function printMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?
- A. Add.event.stopPropagation(); to window.onLoad event handler.
- B. Add event.removeEventListener(); to window.onLoad event handler.
- C. Add event.stopPropagation(); to printMessage function.
- D. Add event.removeEventListener(); toprintMessage function.
Answer: C
NEW QUESTION # 38
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 ').innerHTML.lenght*e
- B. document.getElementById(' card-01 ').style.width
- C. document.getElementById(' card-01 ').getBoundingClientRest().width
- D. document.getElementById(' card-01 ').width
Answer: C
NEW QUESTION # 39
Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
function printMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is
clicked?
- A. Add.event.stopPropagation(); to window.onLoad event handler.
- B. Add event.removeEventListener(); to window.onLoad event handler.
- C. Add event.stopPropagation(); to printMessage function.
- D. Add event.removeEventListener(); toprintMessage function.
Answer: C
NEW QUESTION # 40
Which three statements are true about promises?
The executor of a new promise runs automatically.
- A. A pending promise can become fulfilled, settled or rejected.
- B. A promise has a . then 90 method.
- C. A fulfilled or rejected promise will not change states.
- D. A settled promises can become resolved.
Answer: B,C,D
NEW QUESTION # 41
Refer to code below:
Const objBook = {
Title: 'Javascript',
};
Object.preventExtensions(objBook);
Const newObjBook = objBook;
newObjectBook.author = 'Robert';
What are the values of objBook and newObjBook respectively ?
- A. [title: "javaScript"] [title: "javaScript"]
- B. {author: "Robert"}
{author: "Robert", title: "javaScript} - C. {author: "Robert", title: "javaScript}
Undefined - D. {author: "Robert", title: "javaScript}
{author: "Robert", title: "javaScript}
Answer: A
NEW QUESTION # 42
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js. The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
- A. Vue
- B. Angular
- C. Koa
- D. Express
Answer: B,D
NEW QUESTION # 43
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers
- A. The developer added the dependency as a dev dependency, and
NODE_ENV is set to production. - B. The developer missed the option --add when adding the dependency.
- C. The developer added the dependency as a dev dependency, and
NODE_ENV
Is set to production. - D. The developer missed the option --save when adding the dependency.
Answer: A,C,D
NEW QUESTION # 44
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon,
starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?
- A. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');
- B. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');
- C. productSKU = productSKU .padStart (19. '0').padstart('sku');
- D. productSKU = productSKU .padEnd (16. '0').padstart('sku');
Answer: A
NEW QUESTION # 45
Refer to the code below:
let sayHello = () => {
console.log ('Hello, world!');
};
Which code executes sayHello once, two minutes from now?
- A. setInterval(sayHello, 12000);
- B. delay(sayHello, 12000);
- C. setTimeout(sayHello, 12000);
- D. setTimeout(sayHello(), 12000);
Answer: C
NEW QUESTION # 46
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?
- A. console.timeStamp()
- B. console.trace()
- C. console.timeLog()
- D. console.getTime()
Answer: C
NEW QUESTION # 47
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.setDate(( new Date ( )).getDate () +9);
- B. deliveryDate.date = Date.current () + 9;
- C. deliveryDate.date = new Date(+9) ;
- D. deliveryDate.setDate( Date.current () + 9);
Answer: A
NEW QUESTION # 48
Refer to the following code:
Let sampletext = 'The quick brown fox Jumps';
A developer need to determine if a certain substring is part of a string.
Which three expressions return true for the give substring? Choose 3 answers
- A. sampleText.includes (fox' , 3);
- B. sampleText.substing ('fox');
- C. sampleText.inclides (fox');
- D. sampleText.includes (quick', 4);
- E. sampleText.indexof ('quick') 1== -1;
Answer: A
NEW QUESTION # 49
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