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| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - Arrays and collections - Strings, numbers, and dates - JSON parsing and manipulation - Primitive and complex data types - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion |
| Objects, Functions, and Classes | 25% | - Variable scope and closures - Execution flow and context - ES6 classes and inheritance - Prototypal inheritance - Higher-order functions - Arrow functions - Modules and decorators - Object creation and manipulation - Function declarations and expressions |
| Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability |
| Server Side JavaScript | 8% | - Core Node.js modules - CLI commands - Package management (npm) - Node.js fundamentals - Server-side JavaScript implementations |
| Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging - Custom error types |
| Asynchronous Programming | 13% | - Callbacks - Promises (creation, chaining, error handling) - Event loop and execution flow - Asynchronous patterns for business requirements - Async/Await syntax |
| Browser and Events | 17% | - Event propagation (bubbling and capturing) - Interacting with forms and user input - DOM manipulation - Browser Developer Tools usage - Browser-specific APIs - Event handling and listeners |
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問題 #39
Which two implementations of utils.js support foo and bar?
答案：A,B
解題說明：
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 .
問題 #40
Given the code below:
01 setTimeout(() = > {
02 console.log(1);
03 }, 1100);
04 console.log(2);
05 new Promise((resolve, reject) = > {
06 setTimeout(() = > {
07 reject(console.log(3));
08 }, 1000);
09 }).catch(() = > {
10 console.log(4);
11 });
12 console.log(5);
What is logged to the console?
答案：D
解題說明：
We must track synchronous code, setTimeout callbacks (macrotasks), and Promise rejection handling (microtasks).
Step-by-step:
* Synchronous code first:
* Line 01-03: Schedules a timeout at 1100 ms: logs 1 (later).
* Line 04: console.log(2); # logs 2.
* Lines 05-09: Construct a new Promise.
* The executor runs immediately.
* Inside it, another setTimeout is set for 1000 ms:
* setTimeout(() = > {
* reject(console.log(3));
* }, 1000);
* Line 09-11: .catch(() = > { console.log(4); }) attached to the promise.
* Line 12: console.log(5); # logs 5.
So after all synchronous code, the console has:
* 2
* 5
* At 1000 ms: inner setTimeout fires
The callback:
() = > {
reject(console.log(3));
}
Inside:
* console.log(3) runs first , logging 3.
* console.log(3) returns undefined.
* Then reject(undefined) is called.
So at about 1000 ms, we log:
* 3
When the promise is rejected:
* The .catch handler is scheduled as a microtask .
* After the current macrotask (the timeout callback) completes, the microtask queue runs.
* Thus .catch(() = > { console.log(4); }) runs shortly after, in the same 1000 ms tick.
So immediately after 3, the catch handler logs:
* 4
Now the logs in order are:
* 2
* 5
* 3
* 4
* At 1100 ms: outer setTimeout fires
* The callback from line 01 runs:
console.log(1);
* Logs: 1.
Final log order:
* 2 (line 4, sync)
* 5 (line 12, sync)
* 3 (1000 ms timeout, then inside logs before reject)
* 4 (promise catch microtask after rejection)
* 1 (1100 ms timeout)
Concatenated: 25341.
Therefore, the correct option is:
The answer: A
Study Guide / Concept References (no links):
* Event loop: call stack, macrotask queue (timers), microtask queue (promises)
* setTimeout scheduling and ordering
* Promise rejection, .catch, and microtasks
* Evaluation order of function arguments (reject(console.log(3)))
問題 #41
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .
答案：C
問題 #42
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
答案：C,D
問題 #43
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
答案：C
解題說明：
問題 #44
......
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