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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q132-Q137):

NEW QUESTION # 132
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?

A. Let arr2 = arr1.slice(0, 5);
B. Let arr2 = Array.from(arr1);
C. Let arr2 = arr1;
D. Let arr2 = arr1.sort();

Answer: A,B

NEW QUESTION # 133
A developer has code that calculates a restaurant bill, but generates incorrect answers
while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

A. Using the debugger command on line 03
B. Calling the console.trace (total) method on line 03.
C. Wrapping findSubtotal in a console.log() method.
D. Using the debugger command on line 05.

Answer: D

NEW QUESTION # 134
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?

A. Log
B. Assert
C. Error
D. Message
E. Info

Answer: B,E

NEW QUESTION # 135
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 * from '/path/universalContainersLib.js';universalContainersLib. foo ()7universalContainersLib.bar ();
B. import{foo,bar} from '/path/universalCcontainersLib.js';foo():bar()?
C. import all from
'/path/universalContainersLib.js';universalContainersLib.foo();universalContainersLib.bar ();
D. import * as lib from '/path/universalContainersLib.js';lib.foo();lib. bar ();

Answer: D

NEW QUESTION # 136
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having
latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. DEBUG=http, https node server.js
B. DEBUG=true node server.js
C. NODE_DEBUG=true node server.js
D. NODE_DEBUG=http,https node server.js

Answer: B

NEW QUESTION # 137
......

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