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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q81-Q86):

NEW QUESTION # 81
Which code statement below correctly persists an objects in local Storage ?

A. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
}
B. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
}
D. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
}

Answer: D

Explanation:

NEW QUESTION # 82
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the browser console to execute a script that prevents the load event to be fired.
B. Use the DOM inspector to prevent the load event to be fired.
C. Use the DOM inspector to remove all the elements containing the class ad-library-item.
D. Use the browser to execute a script that removes all the element containing the class ad-library-item.

Answer: D

NEW QUESTION # 83
Cloud Kicks has a class to represent item for sale in an online store, as shown below:

A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?

A. Class clothing item super item (
B. Class Clothingitem (
C. Class clothingitem extends item (
D. Class clothingitem implements item (

Answer: C

NEW QUESTION # 84
Why does second have access to variable a?

A. Inner function ' s scope
B. Outer function ' s scope
C. Hoisting
D. Prototype Chain

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 # 85
A developer has the following array of hourly wages:
Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);
For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.
How should the developer implement the request?

A. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
B. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
C. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
D. let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);

Answer: B

NEW QUESTION # 86
......

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