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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types |
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - CLI commands - Node.js fundamentals - Core Node.js modules - Package management (npm) |
| Asynchronous Programming | 13% | - Callbacks - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax |
| Variables, Types, and Collections | 23% | - Strings, numbers, and dates - Primitive and complex data types - JSON parsing and manipulation - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion - Arrays and collections |
| Browser and Events | 17% | - DOM manipulation - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Event handling and listeners - Browser-specific APIs - Interacting with forms and user input |
| Objects, Functions, and Classes | 25% | - Higher-order functions - Execution flow and context - Arrow functions - Variable scope and closures - ES6 classes and inheritance - Object creation and manipulation - Function declarations and expressions - Prototypal inheritance - Modules and decorators |
| Testing | 7% | - Test coverage and reliability - Unit testing concepts - Test effectiveness evaluation - Writing and modifying unit tests |
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NEW QUESTION # 124
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: D
Explanation:
In Node.js:
* __filename is the absolute path to the current file (including file name).
* __dirname is the absolute path to the directory that contains the current file.
* window.location is a browser-only global, not available in Node.js.
* this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.
NEW QUESTION # 125
Refer to the code below:
What value can a developer expect when referencing o,js,secondCity?
Answer: D
NEW QUESTION # 126
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated to false?
Answer: C
NEW QUESTION # 127
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly insidethe DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
Answer: C
NEW QUESTION # 128
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > {
05 console.log( ' Hello ${this.firstName} ${this.lastName} ' );
06 }
07 }
08
09 const john = new Person();
10 const dan = JSON.parse(JSON.stringify(john)); // (intended deep copy)
11 dan.firstName = ' Dan ' ;
12 dan.name();
(Original line 10 is logically intended to be JSON.parse(JSON.stringify(john)) to perform a JSON clone.) What is the output of the code execution?
Answer: B
Explanation:
* JSON.stringify(john) converts the john object into a JSON string.
* When you JSON.parse that string back, you get a plain object :
* Only data that can be represented in JSON is preserved (numbers, strings, booleans, arrays, plain objects).
* Functions are not preserved and are dropped.
* So dan is a plain object with properties firstName and lastName, but no name method .
* Therefore, dan.name is undefined, and dan.name() throws:
TypeError: dan.name is not a function
The literal string interpolation inside console.log( ' Hello ${...} ' ) is also wrong (single quotes), but the code never reaches that line.
NEW QUESTION # 129
......
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