Valid JavaScript-Developer-I Exam Notes | Valid JavaScript-Developer-I Exam Syllabus

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Asynchronous Programming	13%	- Async/await syntax - Callbacks and callback hell - Fetch API and HTTP requests - Event loop and micro/macro tasks - Promises and chaining
Topic 2: Variables, Types, and Collections	23%	- Working with strings, numbers, dates, and booleans - Truthy and falsy values - Type coercion and conversion rules - Array methods and data manipulation - Variable declaration and initialization - JSON parsing and usage
Topic 3: Debugging and Error Handling	7%	- Debugging tools and breakpoints - Error types and exception handling - Console methods and logging - Defensive programming practices
Topic 4: Browsers and Events	17%	- Browser APIs and Web Storage - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Document Object Model (DOM) manipulation
Topic 5: Server-Side JavaScript	8%	- Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import
Topic 6: Objects, Functions, and Classes	25%	- Function definitions, parameters, and scope - Object creation, properties, and methods - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Modules and imports/exports - Closures and execution context
Topic 7: Testing	7%	- Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions - Code coverage and best practices

>> Valid JavaScript-Developer-I Exam Notes <<

Salesforce Valid JavaScript-Developer-I Exam Notes: Salesforce Certified JavaScript Developer (JS-Dev-101) - ExamBoosts Help you Pass Once

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q24-Q29):

NEW QUESTION # 24
Refer to the code below:

Line 05 causes an error.
What are the values of greeting and salutation once code completes?

A. Greeting is Goodbye and salutation is Hello, Hello.
B. Greeting is Hello and salutation is Hello, Hello.
C. Greeting is Goodbye and salutation is I say Hello.
D. Greeting is Hello and salutation is I say hello.

Answer: B

NEW QUESTION # 25
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?

Answer:

Explanation:
setInterval(isDog, 60000,'cat');

NEW QUESTION # 26
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 ?

A. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
B. This is aScarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a did counted Shirt
C. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt
D. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is aScarf
This is a discounted Shirt

Answer: A

NEW QUESTION # 27
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null

A. '4100null'
B. 0
C. '3100null'
D. 1

Answer: A

NEW QUESTION # 28
Refer to the following code that performs a basic mathematical operation on a provided input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);

A. Return Integer(num +10) /3;
B. Return (Number (num +10 ) / 3;
C. Return Number(num + 10) / 3;
D. Return Number((num +10) /3 );

Answer: B

NEW QUESTION # 29
......

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