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Salesforce Certified JavaScript Developer I Practice Test - Questions Answers, Page 9

Question list

List of questions

Question 81

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A developer wrote a fizzbuzz function that when passed in a number, returns the following: • 'Fizz' if the number is divisible by 3. • 'Buzz' if the number is divisible by 5. • 'Fizzbuzz' if the

Question 82

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A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code: function calculateBill ( items ) { let total = 0; total += findSubTotal(items); to

Question 83

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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". W

Question 84

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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 th

Question 85

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Refer to the code below: let sayHello = () => { console.log ('Hello, world!'); }; Which code executes sayHello once, two minutes from now?

Question 86

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What is the result of the code block?

Question 87

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Refer to the following code that imports a module named utils: import (foo, bar) from '/path/Utils.js'; foo() ; bar() ; Which two implementations of Utils.js export foo and bar such that the cod

Question 88

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developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and i

Question 89

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Refer to the following code: function test (val) { If (val === undefined) { return 'Undefined values!' ; }i f (val === null) { return 'Null value! '; } return val; } Let x; test(x); What

Question 90

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Which code statement below correctly persists an objects in local Storage ?

Question 81

A developer wrote a fizzbuzz function that when passed in a number, returns the following:

• 'Fizz' if the number is divisible by 3.

• 'Buzz' if the number is divisible by 5.

• 'Fizzbuzz' if the number is divisible by both 3 and 5.

• Empty string if the number is divisible by neither 3 or 5.

Which two test cases will properly test scenarios for the fizzbuzz function?

Choose 2 answers

let res = fizzbuzz(5); console.assert ( res === ' ' );

let res = fizzbuzz(15); console.assert ( res === ' fizzbuzz ' )

let res = fizzbuzz(Infinity); console.assert ( res === ' ' )

let res = fizzbuzz(3); console.assert ( res === ' buzz ' )

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Question 82

A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:

function calculateBill ( items ) {

let total = 0;

total += findSubTotal(items);

total += addTax(total);

total += addTip(total);

return total;

}

Which option allows the developer to step into each function execution within calculateBill?

Using the debugger command on line 05.

Using the debugger command on line 03

Calling the console.trace (total) method on line 03.

Wrapping findSubtotal in a console.log() method.

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Question 83

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" ?

Change line 7 to ) () ;

Change line 2 to console.log('Hello' , name() );

Change line 9 to sayHello(world) ();

Change line 5 to function world ( ) {

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Question 84

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?

Terminal running the web server.

Browser performance toots

Browser javaScript console

On the webpage.

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Question 85

Refer to the code below:

let sayHello = () => {

console.log ('Hello, world!');

};

Which code executes sayHello once, two minutes from now?

setTimeout(sayHello, 12000);

setInterval(sayHello, 12000);

setTimeout(sayHello(), 12000);

delay(sayHello, 12000);

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Question 86

What is the result of the code block?

The console logs only 'flag'.

The console logs 'flag' and another flag.

An error is thrown.

The console logs 'flag' and then an error is thrown.

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Question 87

Refer to the following code that imports a module named utils:

import (foo, bar) from '/path/Utils.js';

foo() ;

bar() ;

Which two implementations of Utils.js export foo and bar such that the code above runs without error?

Choose 2 answers

// FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from ' /path/NarUtils.js';

const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }

Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}

const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;

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Question 88

developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.

The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.

Given the code and the information the developer has, which code logs an error at boost with an event?

Server.catch ((server) => {console.log('ERROR', error);});

Server.error ((server) => {console.log('ERROR', error);});

Server.on ('error', (error) => {console.log('ERROR', error);});

Try{server.start();} catch(error) {console.log('ERROR', error);}

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