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Salesforce Certified JavaScript Developer I Practice Test - Questions Answers, Page 17

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Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers
What is the result of the code block?
Refer to the code below: let sayHello = () => { console.log ('Hello, world!'); }; Which code executes sayHello once, two minutes from now?
Refer to the following code: <html lang="en"> <body> <div onclick = "console.log('Outer message') ;"> <button id ="myButton">CLick me<button> </div> </body> <script> function displayMessage(ev) { ev.stopPropagation(); console.log('Inner message.'); } const elem = document.getElementById('myButton'); elem.addEventListener('click' , displayMessage); </script> </html> What will the console show when the button is clicked?
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?
GIven a value, which three options can a developer use to detect if the value is NaN? Choose 3 answers !
A developer has the function, shown below, that is called when a page loads. Where can the developer see the log statement after loading the page in the browser?
Given the HTML below: Which statement adds the priority-account CSS class to the Universal Containers row?
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?
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?

Question 161

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Refer to the following code:

What is the output of line 11?

A.
[1,2]
A.
[1,2]
Answers
B.
["bar", "foo"]
B.
["bar", "foo"]
Answers
C.
["foo:1", "bar:2"]
C.
["foo:1", "bar:2"]
Answers
D.
["foo", "bar"]
D.
["foo", "bar"]
Answers
Suggested answer: D

Question 162

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Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?

Choose 3 answers

A.
z is equal to 3.14.
A.
z is equal to 3.14.
Answers
B.
'use strict' is hoisted, so it has an effect on all lines.
B.
'use strict' is hoisted, so it has an effect on all lines.
Answers
C.
'use strict' has an effect only on line 05.
C.
'use strict' has an effect only on line 05.
Answers
D.
'use strict' has an effect between line 04 and the end of the file.
D.
'use strict' has an effect between line 04 and the end of the file.
Answers
E.
Line 05 throws an error.
E.
Line 05 throws an error.
Answers
Suggested answer: A, C, E

Question 163

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Which statement can a developer apply to increment the browser's navigation history without a page refresh?

Which statement can a developer apply to increment the browser's navigation history without a page refresh?

A.
window.history.pushState(newStateObject);
A.
window.history.pushState(newStateObject);
Answers
B.
window.history.pushStare(newStateObject, ' ', null);
B.
window.history.pushStare(newStateObject, ' ', null);
Answers
C.
window.history.replaceState(newStateObject,' ', null);
C.
window.history.replaceState(newStateObject,' ', null);
Answers
D.
window.history.state.push(newStateObject);
D.
window.history.state.push(newStateObject);
Answers
Suggested answer: C

Question 164

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Refer to the following code block:

What is the console output?

A.
> Better student Jackie got 70% on test.
A.
> Better student Jackie got 70% on test.
Answers
B.
> Jackie got 70% on test.
B.
> Jackie got 70% on test.
Answers
C.
> Uncaught Reference Error
C.
> Uncaught Reference Error
Answers
D.
> Better student Jackie got 100% on test.
D.
> Better student Jackie got 100% on test.
Answers
Suggested answer: D

Question 165

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Refer to the code below:

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

A.
10
A.
10
Answers
B.
11
B.
11
Answers
C.
12
C.
12
Answers
D.
13
D.
13
Answers
Suggested answer: B

Question 166

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Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

A.
console.group(usersList) ;
A.
console.group(usersList) ;
Answers
B.
console.table(usersList) ;
B.
console.table(usersList) ;
Answers
C.
console.info(usersList) ;
C.
console.info(usersList) ;
Answers
D.
console.groupCol lapsed (usersList) ;
D.
console.groupCol lapsed (usersList) ;
Answers
Suggested answer: A

Question 167

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Refer to the code below:

Which value can a developer expect when referencing country,capital,cityString?

A.
'London'
A.
'London'
Answers
B.
undefined
B.
undefined
Answers
C.
An error
C.
An error
Answers
D.
'NaN'
D.
'NaN'
Answers
Suggested answer: D

Question 168

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Refer to the code below:

What is the value of result after line 10 executes?

A.
Error: myFather.job is not a function
A.
Error: myFather.job is not a function
Answers
B.
John Developer
B.
John Developer
Answers
C.
undefined Developer
C.
undefined Developer
Answers
D.
John undefined
D.
John undefined
Answers
Suggested answer: B

Question 169

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Which two options are core Node.js modules?

Choose 2 answers

A.
worker
A.
worker
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B.
isotream
B.
isotream
Answers
C.
exception
C.
exception
Answers
D.
http
D.
http
Answers
Suggested answer: B, D

Question 170

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A developer is trying to handle an error within a function.

Which code segment shows the correct approach to handle an error without propagating it elsewhere?

A.
A.
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B.
B.
Answers
C.
C.
Answers
D.
D.
Answers
Suggested answer: D
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