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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Console methods and logging - Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints |
| Testing | 7% | - Testing frameworks and assertions - Code coverage and best practices - Unit testing concepts - Test doubles and mocks |
| Asynchronous Programming | 13% | - Async/await syntax - Callbacks and callback hell - Event loop and micro/macro tasks - Promises and chaining - Fetch API and HTTP requests |
| Browsers and Events | 17% | - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Window and document object properties - Script loading and execution order - Event handling, propagation, and delegation |
| Server-Side JavaScript | 8% | - Core Node.js modules - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts |
| Objects, Functions, and Classes | 25% | - Closures and execution context - Modules and imports/exports - Decorators and advanced function patterns - Object creation, properties, and methods - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules - Truthy and falsy values - Variable declaration and initialization |
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NEW QUESTION # 74
developer wants to use a module named universalContainersLib and them call functions
from it.
How should a developer import every function from the module and then call the fuctions foo
and bar ?
Answer: D
NEW QUESTION # 75
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function?
Choose 2 answers
Answer: A,B
NEW QUESTION # 76
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of
the properties and methods of the Item class but will also have properties that are specific to
clothes.
Which line of code properly declares the clothingItem class such that it inherits from
Item?
Answer: A
NEW QUESTION # 77
A team at Universal Containers works on a big project and uses yarn to manage the project ' s dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn .
What could be the reason for this?
Answer: A
Explanation:
In JavaScript server-side development using Node.js, dependency management is typically handled through package managers such as npm or yarn . These tools categorize installed packages into:
* dependencies - required for running the application in any environment
* devDependencies - required only during development (testing tools, build tools, documentation generators, etc.) When a package is installed using:
yarn add < package > --dev
it is placed under the " devDependencies " section of package.json.
Behavior of Production Mode
Node.js uses the environment variable:
NODE_ENV=production
When this environment variable is set to production, both npm and Yarn follow the standard Node.js convention and skip installing devDependencies . This is done to optimize production builds and reduce deployment size. This is a known and documented behavior in Node.js package management tools.
Therefore, if:
* The developer added the date-manipulation library as a dev dependency , and
* Other team members execute yarn in an environment where NODE_ENV=production is set, then Yarn will not install that dependency because devDependencies are intentionally excluded in production mode.
This explains the behavior described in the question.
Why the Other Options Are Incorrect
Option A:
" YARN_ENV is set to production " is incorrect because Yarn does not use the variable YARN_ENV for dependency installation behavior. Node.js tools use NODE_ENV , not YARN_ENV.
Option B:
This is incorrect because Yarn automatically writes dependencies into package.json. Unlike older npm versions, there is no need for the --save flag.
Option D:
There is no such option as --add. The correct syntax is simply:
yarn add < package >
Missing an option that does not exist cannot be the cause.
JavaScript Knowledge References
* Node.js uses the environment variable NODE_ENV to determine production or development mode.
* Package managers (npm and Yarn) follow the rule that when NODE_ENV=production , only " dependencies " are installed and " devDependencies " are skipped.
* Yarn automatically persists installed packages to package.json without requiring --save.
* Yarn uses the command yarn add to add dependencies; there is no --add flag.
NEW QUESTION # 78
Refer to the code below:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?
Answer: A
NEW QUESTION # 79
......
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