Free JavaScript-Developer-I Exam Files Verified & Correct Answers Downloaded Instantly [Q72-Q92]

Q72. Which code statement correctly retrieves and return an object from localStorage?
A)

B)

C)

D)

Q73. Refer to the code below:
01 < html lang= ” en ” >
02 < table onclick= ” console.log( ‘ Table log ‘ ); ” >
03 < tr id= ” row1 ” >
04 < td > Click me! < /td >
05 < /tr >
06 < /table >
07 < script >
08 function printMessage(event) {
09 console.log( ‘ Row log ‘ );
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById( ‘ row1 ‘ );
14 elem.addEventListener( ‘ click ‘ , printMessage, false);
15 < /script >
16 < /html >
Which code change should be done for the console to log the following when ” Click me! ” is clicked?
Row log
Table log

Q74. Refer to the code below:

Why does the function bar have access to variable =?

Q75. Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,”Car1 crashed in”)); let car2 = new Promise(resolve => setTimeout(resolve,1500,”Car2 completed”)); let car3 = new Promise(resolve => setTimeout(resolve,3000,”Car3 completed”)); Promise.race([car1,car2,car3])
.then(value=>{
let result = `${value} the race.`;
}).catch(err=>{
console.log(‘Race is cancelled.’,err);
});
What is the value of result when promise.race execues?

Q76. Refer to the following code:
Let obj ={
Foo: 1,
Bar: 2
}
Let output =[],
for(let something in obj{
output.push(something);
}
console.log(output);
What is the output line 11?

Q77. Refer to the code below:
let o = {
get js() {
let city1 = String(“st. Louis”);
let city2 = String(” New York”);
return {
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
}
}
What value can a developer expect when referencing o.js.secondCity?

Q78. A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation = {
02 ” id ” : ” user-01 ” ,
03 ” email ” : ” [email protected] ” ,
04 ” age ” : 25
05 };
Which two options access the email attribute in the object?

Q79. Refer to the following code:

Q80. Considering type coercion, what does the following expression evaluate to?
true + ‘ 13 ‘ + NaN

Q81. Refer to the code below:

A developer uses a client that makes a GET request that uses a promise to handle the request, getRequest returns a promise.
Which code modification can the developer make to gracefully handle an error?
A)

B)

C)

D)

Q82. 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.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

Q83. Refer to the code:
01 const exec = (item, delay) = >
02 new Promise(resolve = > setTimeout(() = > resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec( ‘ x ‘ , ‘ 100 ‘ ), exec( ‘ y ‘ , ‘ 500 ‘ ), exec( ‘ z ‘ , ‘ 100 ‘ )]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?

Q84. There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

Q85. Refer to the following object:
01 const cat = {
02 firstName: ‘ Fancy ‘ ,
03 lastName: ‘ Whiskers ‘ ,
04 get fullName(){
05 return this.firstName + ‘ ‘ + this.lastName;
06 }
07 };
How can a developer access the fullName property for cat?

Q86. 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

Q87. Which code statement below correctly persists an object in localStorage?

Q88. Refer to the code below:

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

Q89. Refer to the following object.

How can a developer access the fullName property for dog?

Q90. Given a value, which two options can a developer use to detect if the value is NaN?

Q91. developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

Q92. A developer wrote the following code:

The developer has a getNextValue function to execute after handleObjectvalue ( ), but does not want to execute getNextValues ( ) If an error occurs.
How can the developer change the code to ensure this behavior?
A)

B)

C)