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Valid JavaScript-Developer-I Practice Guide | 100% Free JavaScript-Developer-I Exam Actual Questions

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q84-Q89):

NEW QUESTION # 84
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

A. Let arr2 = arr1.sort();
B. Let arr2 = Array.from(arr1);
C. Let arr2 = arr1;
D. Let arr2 = arr1.slice(0, 5);

Answer: B,D

NEW QUESTION # 85
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?

A. Undefined
B. ' New York '
C. ' new york '
D. An error

Answer: C

NEW QUESTION # 86
Refer tothe code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line02 to achieve this?
Choose 2 answers

A. 'Update' , {Details : {recordId : '123abc'}}
B. 'Update' , '123abc'
C. 'Update' , (recordId : '123abc'(
D. { type : 'update', recordId : '123abc' }

Answer: A,C

NEW QUESTION # 87
A developer is leading the creation of a new browser application that will serve a single
page application. The team wants to use a new web framework Minimalsit.js. The Lead
developer wants to advocate for a more seasoned web framework that already has a
community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

A. Angular
B. Koa
C. Vue
D. Express

Answer: A,D

NEW QUESTION # 88
A class was written to represent items for purchase in an online store, and a secondclass Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a newrequirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return 'This is a discounted ' + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?

A. This is a ScarfThis is a ShirtThis is a discounted ScarfThis is a discounted Shirt
B. This is aScarfUncaught TypeError: saleItem.description is not a functionThis is a ShirtThis is a did counted Shirt
C. This is a ScarfThis is a ShirtThis is a ScarfThis is a discounted Shirt
D. This is a ScarfUncaught TypeError: saleItem.description is not a functionThis is aScarfThis is a discounted Shirt

Answer: C

NEW QUESTION # 89
......

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