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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Objects, Functions, and Classes	25%	- Higher-order functions - Prototypal inheritance - ES6 classes and inheritance - Object creation and manipulation - Arrow functions - Modules and decorators - Function declarations and expressions - Execution flow and context - Variable scope and closures
Variables, Types, and Collections	23%	- JSON parsing and manipulation - Truthy and falsy evaluations - Strings, numbers, and dates - Primitive and complex data types - Variable declarations and initialization - Type coercion and conversion - Arrays and collections
Testing	7%	- Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation
Debugging and Error Handling	7%	- Breakpoints and code inspection - Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally)
Asynchronous Programming	13%	- Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Callbacks - Async/Await syntax - Event loop and execution flow
Server Side JavaScript	8%	- Package management (npm) - Server-side JavaScript implementations - CLI commands - Node.js fundamentals - Core Node.js modules
Browser and Events	17%	- Event propagation (bubbling and capturing) - DOM manipulation - Interacting with forms and user input - Browser-specific APIs - Browser Developer Tools usage - Event handling and listeners

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q98-Q103):

NEW QUESTION # 98
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 browser to execute a script that removes all the element containing the class ad-library-item.
C. Use the DOM inspector to remove all the elements containing the class ad-library-item.
D. Use the DOM inspector to prevent the load event to be fired.

Answer: B

NEW QUESTION # 99
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page reloads and all JavaScript is reinitialized.
B. The page is navigated away from and previous page in the browser's history is loaded.
C. A popstate event is fired with a state properly that details the application's last state.
D. A navigate event is fired with a state properly that details previous application state.

Answer: B

NEW QUESTION # 100
Which two console logs out NaN?
Choose 2 answers

A. Console.log (10 / 0);
B. Console.log(10 / 'five' ') ;
C. Console.log(10 / Number ('5) );
D. Console.log(parseint ('two') ) ;

Answer: B,D

NEW QUESTION # 101
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?

A. Returns NaN
B. Throws an error
C. Returns 10
D. Returns 0

Answer: C

NEW QUESTION # 102
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers

A. Async runParallel () .then(data);
B. runParallel ( ). done(function(data){
return data;
});
C. runParallel () .then(function(data) return data
D. runParallel () .then(data);

Answer: B,C

NEW QUESTION # 103
......

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