What's more, part of that DumpsFree JavaScript-Developer-I dumps now are free: https://drive.google.com/open?id=1HNBuV_O-fguh81KTBkEHNOSzHh2rY753
This way you will get familiar with Salesforce Certified JavaScript Developer (JS-Dev-101) exam pattern and objectives. No additional plugins and software installation are indispensable to access this JavaScript-Developer-I Practice Test. Furthermore, all browsers and operating systems support this version of the Salesforce JavaScript-Developer-I practice exam.
| Section | Weight | Objectives |
|---|---|---|
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Window and document object properties - Script loading and execution order - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Fetch API and HTTP requests - Promises and chaining - Event loop and micro/macro tasks - Async/await syntax |
| Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Modules and imports/exports - Closures and execution context - Decorators and advanced function patterns |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Type coercion and conversion rules - Variable declaration and initialization - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Truthy and falsy values |
>> JavaScript-Developer-I Valid Test Voucher <<
Our JavaScript-Developer-I study materials take the clients’ needs to pass the test smoothly into full consideration. The questions and answers boost high hit rate and the odds that they may appear in the real exam are high. Our JavaScript-Developer-I study materials have included all the information which the real exam is about and refer to the test papers in the past years. Our JavaScript-Developer-I study materials analysis the popular trend among the industry and the possible answers and questions which may appear in the real exam fully. Our JavaScript-Developer-I Study Materials stimulate the real exam’s environment and pace to help the learners to get a well preparation for the real exam in advance. Our JavaScript-Developer-I study materials won’t deviate from the pathway of the real exam and provide wrong and worthless study materials to the clients.
NEW QUESTION # 17
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?
Answer: B,D
NEW QUESTION # 18
JavaScript:
01 function Tiger() {
02 this.type = ' Cat ' ;
03 this.size = ' large ' ;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' They\ ' re great! ' );
09 };
10
11 function Lion() {
12 this.type = ' Cat ' ;
13 this.size = ' large ' ;
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?
Answer: A,C
Explanation:
There are two valid ways to ensure leo.roar() exists:
* Directly assign a roar function to leo (Option A). Assigning a property to an instance object creates a new method on that instance.
* leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
After this, calling leo.roar() is valid.
* Copy tony's properties into leo using Object.assign (Option B). Object.assign(target, source) copies enumerable own properties from the source object into the target object. Since tony.roar exists, executing:
* Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
* Option C: Object.assign(leo, Tiger) copies properties from the function object Tiger , not from Tiger.
prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
* Option D: leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
JavaScript Knowledge References (text-only)
* Instances have their own properties and do not contain a .prototype property.
* Object.assign(target, source) copies own enumerable properties of the source object.
* Assigning a function as a property of an object creates a callable method.
NEW QUESTION # 19
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A)
B)
C)
D)
Answer: C
NEW QUESTION # 20
A developer wrote the following code:
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs. How can the developer change the code to ensure this behavior?
Answer: B
Explanation:
Requirement:
* getNextValue() should run only if handleObjectValue(x) does not throw an error.
* If an error occurs, handleError(error) should run, and getNextValue() should be skipped.
Option B:
try {
handleObjectValue(x);
getNextValue();
} catch (error) {
handleError(error);
}
Behavior:
* If handleObjectValue(x) succeeds (no error):
* Execution continues to getNextValue();.
* If handleObjectValue(x) throws:
* Control jumps directly to catch, getNextValue() is skipped.
* handleError(error); is called.
This matches the requirement perfectly.
Why others are incorrect:
* A: } then { is invalid JavaScript syntax.
* C:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
}
getNextValue();
* getNextValue() is called after the try...catch regardless of whether an error occurred. Not acceptable.
* D: finally always runs:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
} finally {
getNextValue();
}
* getNextValue() will execute in both success and error cases.
Therefore, the correct approach is B.
Concepts: try/catch control flow, finally semantics, placing code inside vs outside try/catch blocks.
NEW QUESTION # 21
A class was written to represent items for purchase in an online store, and a second class
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 new requirement 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 ?
Answer: B
NEW QUESTION # 22
......
Compared to other products in the industry, JavaScript-Developer-I actual exam have a higher pass rate. If you really want to pass the exam, this must be the one that makes you feel the most. Our company guarantees this pass rate from various aspects such as content and service. Of course, we also consider the needs of users, JavaScript-Developer-I Exam Questions hope to help every user realize their dreams. The 99% pass rate of our JavaScript-Developer-I study guide is a very proud result for us. Buy JavaScript-Developer-I study guide now and we will help you. Believe it won't be long before, you are the one who succeeded!
JavaScript-Developer-I Updated Demo: https://www.dumpsfree.com/JavaScript-Developer-I-valid-exam.html
P.S. Free 2026 Salesforce JavaScript-Developer-I dumps are available on Google Drive shared by DumpsFree: https://drive.google.com/open?id=1HNBuV_O-fguh81KTBkEHNOSzHh2rY753