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| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Variables, Types, and Collections | 23% | - JSON parsing and usage - Type coercion and conversion rules - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Variable declaration and initialization |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices - Console methods and logging |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Script loading and execution order - Window and document object properties - Event handling, propagation, and delegation |
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import - Core Node.js modules |
| Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Closures and execution context - Modules and imports/exports - Function definitions, parameters, and scope - Decorators and advanced function patterns |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Event loop and micro/macro tasks - Fetch API and HTTP requests - Async/await syntax |
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NEW QUESTION # 122
Which option is true about the strict mode in imported modules?
Answer: C
NEW QUESTION # 123
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PrincePrettyPrint. Js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint modules for this import to work?
Answer: D
NEW QUESTION # 124
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04 handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?
Answer: D
NEW QUESTION # 125
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++){
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of the array after the code executes?
Answer: B
NEW QUESTION # 126
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 inside the 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: B
NEW QUESTION # 127
......
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