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| Section | Weight | Objectives |
|---|---|---|
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Script loading and execution order - Browser APIs and Web Storage - Event handling, propagation, and delegation - Window and document object properties |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Event loop and micro/macro tasks - Promises and chaining - Callbacks and callback hell - Async/await syntax |
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging - Defensive programming practices |
| Variables, Types, and Collections | 23% | - Variable declaration and initialization - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Truthy and falsy values - JSON parsing and usage - Array methods and data manipulation |
| Testing | 7% | - Unit testing concepts - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions |
| Objects, Functions, and Classes | 25% | - Closures and execution context - Object creation, properties, and methods - Modules and imports/exports - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns |
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NEW QUESTION # 91
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 # 92
Refer to the following code:
Answer: C
NEW QUESTION # 93
Which two implementations of utils.js support foo and bar?
Answer: A,B
Explanation:
The correct answers are A and C because both use named exports for foo and bar.
A module can export multiple values by name:
export { foo, bar };
This allows another file to import them like this:
import { foo, bar } from ' ./utils.js ' ;
Option A is correct because it defines both functions locally and exports both of them as named exports.
const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar };
Option C is also correct after correcting the typing issue so that both foo and bar are imported first:
import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar };
This is called re-exporting. The module imports foo and bar from another module, then exports them again from utils.js.
Option B is not the best answer for named access because it exports one default object:
export default { foo, bar };
That would require a default import first:
import utils from ' ./utils.js ' ;
utils.foo();
utils.bar();
It does not directly support named imports in the same way as:
import { foo, bar } from ' ./utils.js ' ;
Option D exports a default class. Its foo() and bar() are class instance methods, not named exported functions.
It would require usage like:
import Utils from ' ./utils.js ' ;
const utils = new Utils();
utils.foo();
utils.bar();
So for direct multiple function exports, the correct implementations are A and C .
NEW QUESTION # 94
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?
Answer: A,C,D
Explanation:
We want to convert the number 1982 to a string.
Check each option:
* A. numValue.toText()
* There is no standard toText() method on numbers.
* This will result in TypeError: numValue.toText is not a function.
* B. String(numValue);
* String() as a function converts its argument to a string.
* String(1982) returns " 1982 " .
* This is correct.
* C. ' ' + numValue;
* ' ' is a string; + with a string operand performs string concatenation.
* ' ' + 1982 # " 1982 " .
* This is a common shorthand for number-to-string conversion.
* D. numValue.toString();
* Number.prototype.toString() converts the number to its string representation.
* 1982..toString() or (1982).toString() returns " 1982 " .
* For the variable, numValue.toString() is valid: " 1982 " .
* E. (String)numValue;
* This is not valid JavaScript casting syntax; it is more like a C/Java-style cast.
* In JavaScript, that is parsed as a grouping expression (String) and then numValue; it does not convert numValue to a string.
Thus the correct answers are:
* B. String(numValue);
* C. ' ' + numValue;
* D. numValue.toString();
Relevant concepts: primitive type conversion, String() casting, .toString(), coercion via + with strings.
NEW QUESTION # 95
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?
Answer: C
NEW QUESTION # 96
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