Salesforce JavaScript-Developer-I Exam Introduction - JavaScript-Developer-I New Dumps

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Browser and Events	17%	- Browser-specific APIs - Interacting with forms and user input - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Event handling and listeners - DOM manipulation
Topic 2: Objects, Functions, and Classes	25%	- Prototypal inheritance - Arrow functions - Higher-order functions - Object creation and manipulation - Modules and decorators - Variable scope and closures - Function declarations and expressions - Execution flow and context - ES6 classes and inheritance
Topic 3: Debugging and Error Handling	7%	- Error handling techniques (try/catch/finally) - Custom error types - Breakpoints and code inspection - Console methods for debugging
Topic 4: Asynchronous Programming	13%	- Promises (creation, chaining, error handling) - Callbacks - Event loop and execution flow - Async/Await syntax - Asynchronous patterns for business requirements
Topic 5: Server Side JavaScript	8%	- Server-side JavaScript implementations - Core Node.js modules - Node.js fundamentals - Package management (npm) - CLI commands
Topic 6: Testing	7%	- Test coverage and reliability - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation
Topic 7: Variables, Types, and Collections	23%	- Type coercion and conversion - Arrays and collections - Variable declarations and initialization - Primitive and complex data types - Truthy and falsy evaluations - JSON parsing and manipulation - Strings, numbers, and dates

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q64-Q69):

NEW QUESTION # 64
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !

A. value == NaN
B. value ! == value
C. value === Number.NaN
D. Number.isNaN(value)
E. Object.is(value, NaN)

Answer: A,D

NEW QUESTION # 65
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers

A. []. Concat (... inArray);
B. [ ]. concat.apply(inArray, [ ]);
C. [ ]. Concat.apply ([ ], inArray);
D. [ ]. concat ( [ ....inArray ]);

Answer: A,C

NEW QUESTION # 66
Given the code below:
Setcurrent URL ();
console.log('The current URL is: ' +url );
function setCurrentUrl() {
Url = window.location.href:
What happens when the code executes?

A. The url variable has global scope and line 02 executes correctly.
B. The url variable has local scope and line 02 executes correctly.
C. The url variable has global scope and line 02 throws an error.
D. The url variable has local scope and line 02 throws an error.

Answer: A

NEW QUESTION # 67
Refer to the following code:

Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers

A. Object.assign (leo. Tiger);
B. leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };
C. leo.roar = () => { console.log('They\'re pretty good!'); );
D. Object.assign (leo, tony);

Answer: C,D

NEW QUESTION # 68
A developer wants to use a module named universalContainersLib andthen call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?

A. import all from
'/path/universalContainersLib.js';universalContainersLib.foo();universalContainersLib.bar ();
B. import * from '/path/universalContainersLib.js';universalContainersLib. foo ()7universalContainersLib.bar ();
C. import * as lib from '/path/universalContainersLib.js';lib.foo();lib. bar ();
D. import{foo,bar} from '/path/universalCcontainersLib.js';foo():bar()?

Answer: C

NEW QUESTION # 69
......

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