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Salesforce Certified JavaScript Developer I Practice Test - Questions Answers, Page 19

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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?
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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 181

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Refer to the following code:

Which statement should be added to line 09 for the code to display 'The boat has a capacity of 10 people?

A.
super.size = size;
A.
super.size = size;
Answers
B.
ship.size size;
B.
ship.size size;
Answers
C.
super (size);
C.
super (size);
Answers
D.
this.size = size;
D.
this.size = size;
Answers
Suggested answer: D

Question 182

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Refer to the following array:

Let arr = [1, 2, 3, 4, 5];

Which three options result in x evaluating as [1, 2]?

Choose 3 answer

A.
let x = arr. slice (2);
A.
let x = arr. slice (2);
Answers
B.
let x = arr. slice (0, 2);
B.
let x = arr. slice (0, 2);
Answers
C.
let x arr.filter((a) => (return a <= 2 });
C.
let x arr.filter((a) => (return a <= 2 });
Answers
D.
let x = arr.filter ((a) => 2 }) ;
D.
let x = arr.filter ((a) => 2 }) ;
Answers
E.
let x =arr.splice(0, 2);
E.
let x =arr.splice(0, 2);
Answers
Suggested answer: B, C, E

Question 183

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Refer to the following code:

What is the value of output on line 11?

A.
[1, 2]
A.
[1, 2]
Answers
B.
[''foo'', ''bar'']
B.
[''foo'', ''bar'']
Answers
C.
[''foo'':1, ''bar'':2'']
C.
[''foo'':1, ''bar'':2'']
Answers
D.
An error will occur due to the incorrect usage of the for…of statement on line 07.
D.
An error will occur due to the incorrect usage of the for…of statement on line 07.
Answers
Suggested answer: D

Question 184

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Refer to the code declarations below:

Which three expressions return the string JavaScript?

Choose 3 answers

A.
Str1.join (str2);
A.
Str1.join (str2);
Answers
B.
Str1.concat (str2);
B.
Str1.concat (str2);
Answers
C.
Concat (str1, str2);
C.
Concat (str1, str2);
Answers
D.
$(str1) $ (str2} ';
D.
$(str1) $ (str2} ';
Answers
E.
Str1 + str2;
E.
Str1 + str2;
Answers
Suggested answer: B, D, E

Question 185

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A developer has the following array of hourly wages:

Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);

For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.

How should the developer implement the request?

A.
let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);
A.
let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);
Answers
B.
let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
B.
let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
Answers
C.
let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
C.
let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
Answers
D.
let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
D.
let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
Answers
Suggested answer: C

Question 186

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A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

A.
window.name is assigned to 'hello' and the variable = remains undefined.
A.
window.name is assigned to 'hello' and the variable = remains undefined.
Answers
B.
window.m Is assigned the correct object.
B.
window.m Is assigned the correct object.
Answers
C.
The m variable is assigned the correct object but this.name remains undefined.
C.
The m variable is assigned the correct object but this.name remains undefined.
Answers
D.
The m variable is assigned the correct object.
D.
The m variable is assigned the correct object.
Answers
Suggested answer: A

Question 187

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Given the following code, what is the value of x?

let x = '15' + (10 * 2);

A.
35
A.
35
Answers
B.
50
B.
50
Answers
C.
1520
C.
1520
Answers
D.
3020
D.
3020
Answers
Suggested answer: C

Question 188

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Given the code below:

Which three code segments result in a correct conversion from number to string? Choose 3 answers

A.
let strValue = numValue. toString();
A.
let strValue = numValue. toString();
Answers
B.
let strValue = * * 4 numValue;
B.
let strValue = * * 4 numValue;
Answers
C.
let strValue = numValue.toText ();
C.
let strValue = numValue.toText ();
Answers
D.
let scrValue = String(numValue);
D.
let scrValue = String(numValue);
Answers
E.
let strValue = (String)numValue;
E.
let strValue = (String)numValue;
Answers
Suggested answer: A, B, D

Question 189

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Given the code below:

What is logged to the console'

A.
1 2 3 4 5
A.
1 2 3 4 5
Answers
B.
1 2 5 3 4
B.
1 2 5 3 4
Answers
C.
2 5 1 3 4
C.
2 5 1 3 4
Answers
D.
2 5 3 4 1
D.
2 5 3 4 1
Answers
Suggested answer: D

Question 190

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Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A.
document. querySelector (#row-uc'). classes-push('priority-account');
A.
document. querySelector (#row-uc'). classes-push('priority-account');
Answers
B.
document. getElementByid('row-uc').addClass('priority-account*);
B.
document. getElementByid('row-uc').addClass('priority-account*);
Answers
C.
document. querySelectorAll('#row-uc') -classList.add("priority-accour');
C.
document. querySelectorAll('#row-uc') -classList.add("priority-accour');
Answers
D.
document. queryselector('#row-uc').ClassList.add('priority-account');
D.
document. queryselector('#row-uc').ClassList.add('priority-account');
Answers
Suggested answer: D
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