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Salesforce Certified JavaScript Developer I Practice Test - Questions Answers, Page 16

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Question 151

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Given the following code:

Salesforce Certified JavaScript Developer I image Question 151 63822 09232024002545000000

is the output of line 02?

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Question 152

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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?

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Question 153

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Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.

Which function can the developer use to obtain the time spent by every one of the three functions?

Salesforce Certified JavaScript Developer I image Question 153 63824 09232024002545000000

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Question 154

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A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.

A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Salesforce Certified JavaScript Developer I image Question 154 63825 09232024002545000000

Which two results occur when running this test on the updated sum3 function?

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Question 155

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A 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 turnaround 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?

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Question 156

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Refer to the code below:

Salesforce Certified JavaScript Developer I image Question 156 63827 09232024002545000000

What is the value of result when the code executes?

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Question 157

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developer uses the code below to format a date.

Salesforce Certified JavaScript Developer I image Question 157 63828 09232024002545000000

After executing, what is the value of formattedDate?

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Question 158

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Refer of the string below:

Const str = 'sa;esforce'=;

Which two statement result in the word 'Sale'?

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Question 159

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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.

Salesforce Certified JavaScript Developer I image Question 159 63830 09232024002545000000

What is the value of msg when getAvailableabilityMessage ("newUserName") is executed and get Availability ("newUserName") returns true?

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Question 160

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myArraym can have one level, two levels, or more levels.

Which statement flattens myArray when it can be arbitrarily nested?

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myArraym can have one level, two levels, or more levels. Which statement flattens myArray when it can be arbitrarily nested?
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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?
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Refer to the code below: 01 let car1 = new promise((_, reject) => 02 setTimeout(reject, 2000, "Car 1 crashed in")); 03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, "Car 2 completed")); 04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, "Car 3 Completed")); 05 Promise.race([car1, car2, car3]) 06 .then(value => ( 07 let result = $(value) the race. `; 08 )) 09 .catch( arr => ( 10 console.log("Race is cancelled.", err); 11 )); What is the value of result when Promise.race executes?
Given the code below: What is logged to the console'
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