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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q119-Q124):

NEW QUESTION # 119
developer uses the code below to format a date.

After executing, what is the value offormattedDate?

A. October 05, 2020
B. June 10, 2020
C. November 05, 2020
D. May 10, 2020

Answer: B

NEW QUESTION # 120
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. The imported library uses events and
callbacks to start the servers
Which code should be inserted at the line 03 to set up an event and start the web server ?

A. server()
B. Server.start ();
C. serve(( port) => (
D. server.on(' connect ' , ( port) => {
console.log('Listening on ' , port) ;})
E. console.log( 'Listening on ', port) ;

Answer: D

NEW QUESTION # 121
Which code statement below correctly persists an objects inlocal Storage ?

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

Answer: B

NEW QUESTION # 122
Refer to the code below:

Considering the implementations of 'use strict' on line 04, which three statements describes the executes of the code? Choose 3 answers

A. 'use strict' has an effect only on line 05.
B. 'use strict , is hoisted, so it has an effect on all lines.
C. Line 05 throws an error.
D. 'use strict' has an effect between line 04 and the end of the file.
E. Z is equal to 3,14.

Answer: B,C,E

NEW QUESTION # 123
Refer to the string below.
Const str='Salesforce';
Which two statements results in the word 'Sales'?

Answer:

Explanation:
See the Answer below in explanation:
Explanation
Str.substring(0,5);
Str.substr(0,5);

NEW QUESTION # 124
......

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