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| Section | Weight | Objectives |
|---|---|---|
| Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - JSON parsing and usage - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - Truthy and falsy values |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Modules and imports/exports - Class syntax, inheritance, and prototypes - Closures and execution context - Decorators and advanced function patterns - Object creation, properties, and methods |
| Browsers and Events | 17% | - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order - Window and document object properties - Document Object Model (DOM) manipulation |
| Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Defensive programming practices - Error types and exception handling |
| Asynchronous Programming | 13% | - Promises and chaining - Event loop and micro/macro tasks - Fetch API and HTTP requests - Async/await syntax - Callbacks and callback hell |
| Testing | 7% | - Unit testing concepts - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices |
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NEW QUESTION # 107
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
Answer: B
Explanation:
Two key browser events:
* DOMContentLoaded (fired on document): Fired when the HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subresources to finish loading.
* load (fired on window): Fired when the entire page is fully loaded, including all dependent resources such as stylesheets and images.
The requirement states:
"... when the webpage is fully loaded with HTML content and all related files." That matches the semantics of the load event on the window object.
So the correct code is:
window.addEventListener( ' load ' , personalizeWebsiteContent);
Why others are incorrect:
* A: DOMContentLoaded fires earlier, when HTML is parsed, but before all related files (images, some styles, etc.) are guaranteed to be loaded.
* B: ' onDOMContentLoaded ' is not a valid event name; the event is ' DOMContentLoaded ' .
* D: When using addEventListener, the event type is ' load ' , not ' onload ' . ' onload ' is the name of the handler property (window.onload = ...), not the event string.
Relevant concepts: window.load event, DOMContentLoaded, addEventListener syntax, page load lifecycle.
NEW QUESTION # 108
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
Answer: C,D,E
NEW QUESTION # 109
Refer to the following code:
Answer: C
NEW QUESTION # 110
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:
What is the output of the code execution?
Answer: D
NEW QUESTION # 111
A developer wants to use a module called DataPrettyPrint. This module exports one default functioncalled printDate ().
How can a developer import and use the printDate() function?
Answer: D
NEW QUESTION # 112
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