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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browsers and Events | 17% | - Event handling, propagation, and delegation - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Script loading and execution order - Window and document object properties |
| Topic 2: Debugging and Error Handling | 7% | - Error types and exception handling - Defensive programming practices - Console methods and logging - Debugging tools and breakpoints |
| Topic 3: Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Topic 4: Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Closures and execution context - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Modules and imports/exports - Decorators and advanced function patterns |
| Topic 5: Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Variable declaration and initialization - Truthy and falsy values - JSON parsing and usage |
| Topic 6: 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 7: Server-Side JavaScript | 8% | - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules |
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NEW QUESTION # 40
Given HTML below:
<div>
<div id ="row-uc"> Universal Container</div>
<div id ="row-aa">Applied Shipping</div>
<div id ="row-bt"> Burlington Textiles </div>
</div>
Which statement adds the priority = account CSS class to the universal Containers row ?
Answer: C
NEW QUESTION # 41
Function to test:
01 const sum3 = (arr) = > {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1] ;
05 return arr[0] + arr[1] + arr[2];
06 };
Which two assert statements are valid tests for this function?
Answer: B,C
Explanation:
Evaluate each test:
A). sum3([1, ' 2 ' ])
* Array length is 2 # line 4: arr[0] + arr[1] # 1 + ' 2 ' # ' 12 ' (string).
* Assertion: ' 12 ' == 12 is true (type coercion). However, this "test" is not logically correct: a numeric sum function should not be expected to return ' 12 ' as a string. It passes only because of weak equality coercion, so it is not a good/valid test of correct behavior.
B). sum3([ ' hello ' , 2, 3, 4])
* Length # 3 # line 5: ' hello ' + 2 + 3 # ' hello2 ' + 3 # ' hello23 ' .
* ' hello23 ' === NaN is always false because NaN is never equal to anything, not even itself. This assertion fails and also misunderstands how NaN comparisons work.
C). sum3([-3, 2])
* Length 2 # -3 + 2 = -1.
* Assertion: -1 === -1 # true. This is a correct and meaningful test.
D). sum3([0])
* Length 1 # returns arr[0] # 0.
* Assertion: 0 === 0 # true. Also a correct and meaningful test.
Therefore, the valid and logically correct tests here are C and D.
NEW QUESTION # 42
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
Answer: C
NEW QUESTION # 43
A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below:
Class Post {
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?
Answer: C
NEW QUESTION # 44
A developer creates an object where its properties should be immutable and prevent properties from being added or modified.
Which method should be used to execute this business requirement ?
Answer: A
NEW QUESTION # 45
......
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