In fact, in real life, we often use performance of high and low to measure a person's level of high or low, when we choose to find a good job, there is important to get the JS-Dev-101 certification as you can. Our society needs to various comprehensive talents, rather than a man only know the book knowledge but not understand the applied to real bookworm, therefore, we need to get the JS-Dev-101 Certification, obtain the corresponding certifications. What a wonderful news it is for everyone who wants to pass the certification exams. There is a fabulous product to prompt the efficiency--the JS-Dev-101 exam prep, as far as concerned, it can bring you high quality learning platform to pass the variety of exams.
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Passing Score: | 65% |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Exam Price: | USD 200 |
| Exam Format: | Multiple choice, Multiple select |
| Available Languages: | Japanese, English |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Developer |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Exam Duration: | 105 minutes |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity |
| Official Syllabus URL: | https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101 |
>> Valid JS-Dev-101 Real Test <<
Learning is sometimes extremely dull and monotonous, so few people have enough interest in learning, so teachers and educators have tried many ways to solve the problem. Research has found that stimulating interest in learning may be the best solution. Therefore, the JS-Dev-101 prepare guide’ focus is to reform the rigid and useless memory mode by changing the way in which the JS-Dev-101 Exams are prepared. JS-Dev-101 practice materials combine knowledge with the latest technology to greatly stimulate your learning power. By simulating enjoyable learning scenes and vivid explanations, users will have greater confidence in passing the qualifying exams.
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
NEW QUESTION # 141
Most accurate tests for:
const arr = Array(5).fill(0);
Answer: B,D
Explanation:
The correct answers are C and D.
The statement:
const arr = Array(5).fill(0);
creates an array with 5 elements, and every element is filled with the value 0.
So the array becomes:
[0, 0, 0, 0, 0]
A professional test should verify both important expectations:
arr.length === 5
and:
each element === 0
Option C is correct because it checks every element in the array:
arr.forEach(e => console.assert(e === 0));
This confirms that each array element was filled with 0.
Option D is correct because it checks the array length:
console.assert(arr.length === 5);
This confirms that the array contains exactly five elements.
Option A is incorrect because the array length is not 0; it is 5.
Option B is incorrect for two reasons. First, arr[5] is outside the valid index range. The valid indexes are:
0, 1, 2, 3, 4
So:
arr[5]
returns:
undefined
Second, arr.length === 0 is false because the length is 5.
Therefore, the verified answers are C and D.
NEW QUESTION # 142
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?
Answer: A,B,C
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 # 143
Given the following code:
What is the output of line 02?
Answer: D
NEW QUESTION # 144
Why does second have access to variable a?
Answer: B
Explanation:
The answer is B because JavaScript uses lexical scope.
When a function is created inside another function, the inner function can access variables from the outer function where it was defined.
For example:
function first() {
let a = 10;
function second() {
console.log(a);
}
second();
}
Here, a belongs to the outer function first(). The inner function second() can access it because JavaScript looks for variables through the scope chain.
The lookup works like this:
1. Look inside second()
2. If not found, look inside first()
3. If not found, look in the global scope
Since a is found in the outer function's scope, second() can use it.
This is also the basis of a closure. A closure allows an inner function to remember and access variables from its outer lexical environment.
Why the other options are incorrect:
A is not the best answer because a is not declared inside second() itself.
C is incorrect because the prototype chain is used for object property lookup, not local variable scope lookup.
D is incorrect because hoisting explains how declarations are moved during compilation, but it does not explain why an inner function can access an outer function's variable.
Therefore, the verified answer is B.
NEW QUESTION # 145
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String('St. Louis');
04 let city2 = String('New York');
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?
Answer: A
Explanation:
1. Getter Functions in JavaScript
In JavaScript, when an object uses the get keyword, it defines a getter method. Accessing a getter property executes the function and returns its value. Thus:
o.js
does not return the getter function; instead, it executes the function located at:
get js() { ... }
and returns the object inside the return block.
2. Behavior of String() and toLowerCase()
Inside the getter:
let city1 = String('St. Louis');
let city2 = String('New York');
String() creates a string value.
Then, the returned object is constructed as:
{
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
The method toLowerCase() is a standard JavaScript string method that returns a new string with all alphabetic characters converted to lowercase.
Therefore:
city2.toLowerCase()
returns:
'new york'
3. Referencing the Property
When the developer writes:
o.js.secondCity
the following happens:
The getter js runs and returns an object.
The returned object includes the property:
secondCity: 'new york'
Accessing .secondCity retrieves the lowercase string 'new york'.
Therefore, the correct value is 'new york'.
Why the Other Options Are Incorrect
A . undefined - incorrect because the property secondCity clearly exists in the returned object.
B . An error - incorrect because no invalid operations occur; all methods and properties are valid.
C . 'New York' - incorrect because toLowerCase() transforms the string to lowercase.
JavaScript Knowledge Reference (Text-Based)
Getter methods using the get keyword return computed values when accessed.
JavaScript String values support the toLowerCase() method, which returns a lowercase version of the original string.
Accessing nested properties like o.js.secondCity triggers the getter, returning the constructed object.
NEW QUESTION # 146
......
JS-Dev-101 Real Torrent: https://www.validbraindumps.com/JS-Dev-101-exam-prep.html