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| Section | Weight | Objectives |
|---|---|---|
| Server-Side JavaScript | 8% | - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Browser APIs and Web Storage |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Array methods and data manipulation - Type coercion and conversion rules |
| Debugging and Error Handling | 7% | - Defensive programming practices - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Closures and execution context - Object creation, properties, and methods - Modules and imports/exports |
| Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Callbacks and callback hell - Async/await syntax - Promises and chaining - Fetch API and HTTP requests |
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NEW QUESTION # 60
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?
Answer: A,D
NEW QUESTION # 61
Given the following code:
let x = null;
console.log(typeof x);
What is the output?
Answer: C
NEW QUESTION # 62
Given the code below:
Const copy = JSON.stringify((new String ('false') , new Bolean(false) undefined)); What is the value of copy?
Answer: B
NEW QUESTION # 63
Considering type coercion, What does the following expression evaluate to?
True + '13 ' + NaN
Answer: B
NEW QUESTION # 64
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
Choose 2 answers
Answer: B,D
NEW QUESTION # 65
......
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