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Salesforce JavaScript-Developer-I Practice Tests - Precise JavaScript-Developer-I Pdf Files and Fast-download Accurate Salesforce Certified JavaScript Developer I Exam Study Material

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Salesforce Certified JavaScript Developer I exam consists of 60 multiple-choice questions that must be completed within 105 minutes. JavaScript-Developer-I Exam covers a range of topics, including JavaScript, Salesforce fundamentals, and Lightning Web Components. Candidates will be tested on their ability to write efficient, reusable, and maintainable code, as well as their knowledge of best practices and industry standards.

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q147-Q152):

NEW QUESTION # 147
01 function Animal(size, type) {
02 this.type = type || ' Animal ' ;
03 this.canTalk = false;
04 }
05
06 Animal.prototype.speak = function() {
07 if (this.canTalk) {
08 console.log( " It spoke! " );
09 }
10 };
11
12 let Pet = function(size, type, name, owner) {
13 Animal.call(this, size, type);
14 this.size = size;
15 this.name = name;
16 this.owner = owner;
17 }
18
19 Pet.prototype = Object.create(Animal.prototype);
20 let pet1 = new Pet();
Given the code above, which three properties are set for pet1?

A. type
B. name
C. owner
D. canTalk
E. speak

Answer: A,B,D

Explanation:
When pet1 = new Pet(); is created:
* Inside Pet constructor:
Animal.call(this, size, type);
this.size = size;
this.name = name;
this.owner = owner;
* Animal.call(this, size, type):
* Sets this.type = type || ' Animal ' # ' Animal ' (because type is undefined).
* Sets this.canTalk = false.
* Then this.size, this.name, this.owner are set (to undefined since no args passed), but they do exist as properties .
So as own properties, pet1 has: type, canTalk, size, name, owner.
* speak is defined on Animal.prototype, so pet1.speak exists by inheritance, but is not an own data property created in the constructor.
From the listed options, three important properties directly set by constructor logic and clearly used in behavior are:
* canTalk
* name
* type
Thus, C, D, E.

NEW QUESTION # 148
Refer to the following code:
class Vehicle{
constructor(plate){
this.plate = plate;
}
}
class Truck extends Vehicle{
constructor(plate, weight){
//Missing code
this.weight = weight;
}
displayWeight(){
console.log(`The truck ${this.plate} has a weight of ${this.weight}lb.`);
}
}let myTruck = new Truck('123Ab',5000);
myTruck.displayWeight();
Which statement should be added to missing code for the code to display 'The truck 123AB has a weight of 5000lb.

A. super(plate)
B. Vehicle.plate = plate
C. super.plate = plate
D. this.plate = plate

Answer: A

NEW QUESTION # 149
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?

A. setInterval(isDog, 60000,'cat');

Answer: A

NEW QUESTION # 150
Refer to the code below:
What is the output after the code executes?

A. ReferenceError: eyeColor is not defined
B. Developer
C. ReferenceError: assignment to undeclared variable ''Person''
D. undefined

Answer: D

NEW QUESTION # 151
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. > 5 > 0
B. > 5 >undefined
C. > 5 > -1
D. > true > false

Answer: B

NEW QUESTION # 152
......

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