[2023] Use Valid New JavaScript-Developer-I Test Notes & JavaScript-Developer-I Valid Exam Guide
JavaScript-Developer-I Actual Questions Answers PDF 100% Cover Real Exam Questions
NEW QUESTION # 131
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
- A. > true > false
- B. > 5 > -1
- C. > 5 >undefined
- D. > 5 > 0
Answer: C
Explanation:
NEW QUESTION # 132
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:
- A. The information stored in the window.localStorage property
- B. The style, event listeners and other attributes applied to the carSpeed DOM element
- C. A variable displaying the number of instances created for the Car Object.
- D. The values of the carSpeed and fourWheels variables
Answer: A,B
NEW QUESTION # 133
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;
- B. ship.size size;
- C. this.size = size;
- D. super (size);
Answer: C
NEW QUESTION # 134
Refer to the code below:
Which code executes syhello once, two minutes from now?
- A. delay (sayhello, 120000) ;
- B. SetTimeout (sayhello, 120000) ;
- C. SetInterval (sayhello, 120000) ;
- D. SetTimeout (sayhello( ), 120000) ;
Answer: D
NEW QUESTION # 135
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A. D
- B. C
- C. B
- D. A
Answer: D
NEW QUESTION # 136
Which two console logs output NaN?
Choose 2 answers | |
- A. console.loeg(10 / 'five');
- B. console.log(parseInt ' ("two')) ;
- C. console.log(10 / Number('5) ) ;
- D. console.log(10 / 0);
Answer: A,B
NEW QUESTION # 137
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 number in the array, The test passes:
Let res = sum2([1, 2, 3 ]) ;
console.assert(res === 6 );
Res = sum3([ 1, 2, 3, 4]);
console.assert(res=== 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array. The test passes:
Which two results occur when running the test on the updated sum3 function ?
Choose 2 answers
- A. The line 05 assertion passes.
- B. The line 02 assertion passes.
- C. The line 02 assertion fails
- D. The line 05 assertion fails.
Answer: B,D
NEW QUESTION # 138
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
- A. 'NaN'
- B. An error
- C. undefined
- D. 'London'
Answer: A
NEW QUESTION # 139
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.
Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers
- A. error
- B. Message
- C. Info
- D. Log
- E. Assert
Answer: A,B,E
NEW QUESTION # 140
A developer at Universal Containers creates a new landing page based on HTML, CSS, and
JavaScript TO ensure that visitors have a good experience, a script named personaliseContext
needs to be executed when the webpage is fully loaded (HTML content and all related files ), in
order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above
business requirement?
- A. document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);
- B. Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);
- C. window.addEventListener('load',personalizeWebsiteContext);
- D. window.addEventListener('onload', personalizeWebsiteContext);
Answer: C
NEW QUESTION # 141
Refer to the code below:
Let inArray - [ [1, 2] , [3, 4, 5] ];
Which two statements result in the array [1, 2, 3, 4, 5 ]?
- A. [ ] . concat. Apply ( [ ], inArray) ;
- B. [ ] . concat. Apply (inArray, [ ] );
- C. [ ]. Concat ( [...InArray] );
- D. [ ] . concat. ( ... inArray) ;
Answer: A,C
NEW QUESTION # 142
A developer wants to use a module named universalContainerLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?
- A. import + from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - B. import - as lib from '/path/universalContainerLib.js''
lib.foo( ) ;
lib. bar ( ) ; - C. import all from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - D. import (foo,bar) from '/path/universalContainerLib.js''
foo ( ) ;
bar ( ) ;
Answer: B
NEW QUESTION # 143
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?
- A. Terminal running the web server.
- B. Browser performance tools
- C. Browser javaScript console
- D. On the webpage
Answer: C
NEW QUESTION # 144
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
- A. Replace line 04 with result = result +current;
- B. Replace line 05 with return result;
- C. Replace line 02 with return arr.map(( result, current) => (
- D. Replace line 03 with if(arr.length == 0 ) ( return 0; )
Answer: B
NEW QUESTION # 145
A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?
- A. A popstate event is fired with a state property that details the application's last state.
- B. The page reloads and all Javascript is reinitialized.
- C. A navigate event is fired with a state property that details the previous application state.
- D. The page is navigated away from and the previous page in the browser's history is loaded.
Answer: D
NEW QUESTION # 146
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?
- A. The developer added the dependency as a dev dependency, and NOOK_ENV is set to production.
- B. The developer missed the option - add when adding the dependency.
- C. The developer added the dependency as a dev dependency, and NODK_ENV is set to production.
- D. The developer missed the option -ssve when adding the dependency.
Answer: A,C,D
NEW QUESTION # 147
Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, "car 1 crashed in" =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed") Let car3 =new Promise(resolve => setTimeout(resolve, 3000, "car 3 completed") Promise.race(( car1, car2, car3))
.then (value => (
Let result = '$(value) the race.';)}
.catch(arr => {
console.log("Race is cancelled.", err);
});
What is the value of result when Promise.race executes?
- A. Car 2 completed the race.
- B. Race is cancelled.
- C. Car 3 completes the race
- D. Car 1 crashed in the race.
Answer: A
NEW QUESTION # 148
Cloud Kicks has a class to represent item for sale in an online store, as shown below:
A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?
- A. Class clothing item super item (
- B. Class Clothingitem (
- C. Class clothingitem extends item (
- D. Class clothingitem implements item (
Answer: C
NEW QUESTION # 149
A developer removes the HTML class attributes from the check button, so now it is simply:
<button>checkout<button>.
There is a test verify the existence of the checkout button, however it look for a button with class'' blue''. The test fails because no such button is f.
Which type of test category describes this test?
- A. False negative
- B. True positive
- C. True negative
- D. False positive
Answer: B
NEW QUESTION # 150
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" ?
- A. Change line 7 to ) () ;
- B. Change line 2 to console.log('Hello' , name() );
- C. Change line 5 to function world ( ) {
- D. Change line 9 to sayHello(world) ();
Answer: B
NEW QUESTION # 151
Refer to the code below:
When does promise. Finally on line 08 get called?
- A. When resolved and settled
- B. When resolved or rejected
- C. When resolved
- D. When rejected
Answer: B
NEW QUESTION # 152
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- C. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
- D. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
Answer: A
NEW QUESTION # 153
A developer publishes a new version of a package with new feature 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?
- A. 1.1.4
- B. 2.0.0
- C. 1.2.3
- D. 1.2.0
Answer: D
NEW QUESTION # 154
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
- A. [1, 2, 3, 4, 5, 4, 4]
- B. [1, 2, 3, 4, 4, 5, 4]
- C. [1, 2, 3, 5]
- D. [1, 2, 3, 4, 5, 4]
Answer: B
NEW QUESTION # 155
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