The Secret Of Salesforce JavaScript-Developer-I Real Exam

NEW QUESTION 1
developer wants to use a module nameduniversalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the fuctions foo and bar ?

• A. import * ad lib from ‘/path/universalContainersLib.js’; lib.foo();lib.bar();
• B. import (foo, bar) from ‘/path/universalContainersLib.js’; foo();bar();
• C. import all from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();
• D. import * from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();

Answer: A

NEW QUESTION 2
Why would a developer specify a package.jason as a developed forge instead of a dependency ?

• A. It is required by the application in production.
• B. It is only needed for local development and testing.
• C. Other requiredpackages depend on it for development.
• D. It should be bundled when the package is published.

Answer: B

NEW QUESTION 3
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
Thedeveloper needs to insert a code statement in the location shown. The code statement has these requirements:
* 1. Does require an import
* 2. Logs an error when the boolean statement evaluates to false
* 3. Works in both the browser and Node.js
Which meet the requirements?

• A. assert (number % 2 === 0);
• B. console.error(number % 2 === 0);
• C. console.debug(number % 2 === 0);
• D. console.assert(number % 2 === 0);

Answer: B

NEW QUESTION 4
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?

• A. document.getElementById(‘ card-01 ’).getBoundingClientRest().width
• B. document.getElementById(‘ card-01 ’).style.width
• C. document.getElementById(‘ card-01 ’).width
• D. document.getElementById(‘ card-01 ’).innerHTML.lenght*e

Answer: A

NEW QUESTION 5
Given the following code: document.body.addEventListener(‘ click ’, (event) => { if (/* CODE REPLACEMENT HERE */) {
console.log(‘button clicked!’);
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

• A. Event.clicked
• B. e.nodeTarget ==this
• C. event.target.nodeName == ‘BUTTON’
• D. button.addEventListener(‘click’)

Answer: C

NEW QUESTION 6
A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below: ClassPost {
// Insert code here This.body =body This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

• A. super (body, author, viewCount) {
• B. Function Post (body, author, viewCount) {
• C. constructor (body, author, viewCount) {
• D. constructor() {

Answer: C

NEW QUESTION 7
Which function should a developer use to repeatedly execute code at a fixed interval ?

• A. setIntervel
• B. setTimeout
• C. setPeriod
• D. setInteria

Answer: A

NEW QUESTION 8
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 navigate event is fired with a state property that details the previous application state.
• B. The page is navigated away from and the previous page in the browser’s history is loaded.
• C. The page reloads and all Javascript is reinitialized.
• D. A popstate event is fired with a state property that details the application’s last state.

Answer: B

NEW QUESTION 9
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected? Which 2 are correct?

• A. Promise.reject(‘cool error here’).then(error => console.error(error));
• B. Promise.reject(‘cool error here’).catch(error => console.error(error));
• C. New Promise((resolve, reject) => (throw ‘cool error here’}).catch(error => console.error(error)) ;
• D. New Promise(() => (throw ‘cool error here’}).then(null, error => console.error(error)));

Answer: BC

NEW QUESTION 10
A developer has code that calculates a restaurant bill, but generates incorrectanswers 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?

• A. Using the debugger command on line 05.
• B. Using the debugger command on line 03
• C. Calling the console.trace (total) method on line 03.
• D. Wrapping findSubtotal in a console.log() method.

Answer: A

NEW QUESTION 11
Which three statements are true about promises ? Choose 3 answers

• A. The executor of a new Promise runs automatically.
• B. A Promise has a .then() method.
• C. A fulfilled or rejected promise will not change states .
• D. A settled promise can become resolved.
• E. A pending promise canbecome fulfilled, settled, or rejected.

Answer: BCE

NEW QUESTION 12
A team that works on a big project uses npm to deal with projects dependencies. A developer added a dependency does not get downloaded when they executenpm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

• A. The developer missed the option --add when adding the dependency.
• B. The developer added the dependency as a dev dependency, and NODE_ENVIs set to production.
• C. The developer missed the option --save when adding the dependency.
• D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

Answer: BCD

NEW QUESTION 13
Refer to the code:

Given the code above, which three properties are set pet1? Choose 3answers:

• A. Name
• B. canTalk
• C. Type
• D. Owner
• E. Size

Answer: BCE

NEW QUESTION 14
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))
.t hen (value => (
Let result = ‘$(value) the race.’;)}
.catch(arr => {
console.log(“Race is cancelled.”, err);
});
What isthe value of result when Promise.race executes?

• A. Car 3 completes the race
• B. Car 2 completed the race.
• C. Car 1 crashed in the race.
• D. Race is cancelled.

Answer: B

NEW QUESTION 15
Given the code below:

What is logged to the console?

• A. 1 2 3
• B. 1 3 2
• C. 2 1 3
• D. 2 3 1

Answer: D

NEW QUESTION 16
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