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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Callbacks and callback hell - Fetch API and HTTP requests - Async/await syntax - Event loop and micro/macro tasks - Promises and chaining |
| Topic 2: Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Topic 3: Testing | 7% | - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices - Test doubles and mocks |
| Topic 4: Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules - Module system and require/import |
| Topic 5: Browsers and Events | 17% | - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Script loading and execution order - Window and document object properties |
| Topic 6: Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Closures and execution context - Modules and imports/exports - Object creation, properties, and methods - Function definitions, parameters, and scope - Decorators and advanced function patterns |
| Topic 7: Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Truthy and falsy values - Type coercion and conversion rules - Variable declaration and initialization - JSON parsing and usage |
>> JavaScript-Developer-I PDF Questions <<
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NEW QUESTION # 61
Refer to the code snippet:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after the code executes?
Answer: B
Explanation:
Comprehensive and Detailed Explanation:
The loop removes every 4:
* Start: [1, 2, 3, 4, 4, 5, 4, 4]
* i=0 # 1 (no change)
* i=1 # 2 (no change)
* i=2 # 3 (no change)
* i=3 # 4 # splice removes index 3 # [1,2,3,4,5,4,4], then i-- # 2
* Next loop, i=3 # 4 again # splice # [1,2,3,5,4,4], i-- # 2
* i=3 # 5 (no change)
* i=4 # 4 # splice # [1,2,3,5,4] , i-- # 3
* i=4 # 4 # splice # [1,2,3,5], i-- # 3
* Next i=4, array.length is 4 # loop ends.
All 4s removed, final array: [1, 2, 3, 5].
NEW QUESTION # 62
Which two options are core Node.js modules?
Choose 2 answers
Answer: A,B
NEW QUESTION # 63
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use thenew web framework Minimalist.Js.
The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers
Answer: B,C
NEW QUESTION # 64
Given the code below:
What is logged to the console'
Answer: A
NEW QUESTION # 65
Refer to the code below:
const pi = 3.1415926;
What is the data type of pi?
Answer: A
Explanation:
In JavaScript, there is only one numeric type for ordinary numbers: number.
* JavaScript number is a double-precision 64-bit binary format (IEEE 754).
* There is no separate float, double, or decimal type in core JavaScript.
So:
typeof pi === ' number ' ;
Hence, the correct answer is:
* A. Number
Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.
Study Guide Concepts:
* JavaScript primitive types
* typeof operator and number
* Lack of separate float / double / decimal types in JS
NEW QUESTION # 66
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