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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Closures and execution context - Decorators and advanced function patterns - Modules and imports/exports - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Object creation, properties, and methods |
| Server-Side JavaScript | 8% | - Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import |
| Testing | 7% | - Testing frameworks and assertions - Code coverage and best practices - Unit testing concepts - Test doubles and mocks |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Fetch API and HTTP requests - Async/await syntax - Event loop and micro/macro tasks |
| Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Browser APIs and Web Storage |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Array methods and data manipulation - JSON parsing and usage - Truthy and falsy values - Type coercion and conversion rules |
>> JavaScript-Developer-I考題 <<
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問題 #126
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
答案：A
解題說明：
We must understand pass-by-value for primitives in JavaScript.
* Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
* a is 10
* b is 10 (independent copy)
* Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
* param receives the value of b, which is 10.
* Inside the function, param is a local variable .
* param = 5; changes only this local copy.
* It does not affect b outside the function.
After the function call:
* a is still 10.
* b is still 10.
* Result:
const result = a + ' - ' + b;
* a is 10.
* b is 10.
* String concatenation: ' 10 - 10 ' .
So result is:
" 10 - 10 "
Therefore, the correct option is:
The answer: D
Study Guide Concepts:
* Primitive values (numbers, strings, booleans) are passed by value
* Function parameters as local variables
* String concatenation with +
* Difference between mutating references vs primitives
問題 #127
developer wants to use a module nameduniversalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?
答案：C
問題 #128
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
答案：B
問題 #129
Given the code below:
const delay = sync delay => {
Return new Promise((resolve, reject) => {
setTimeout (resolve, delay);});};
const callDelay =async () =>{
const yup =await delay(1000);
console.log(1);
What is logged to the console?
答案：D
問題 #130
Refer to the code below:
What value can a developer expect when referencing o,js,secondCity?
答案：B
問題 #131
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JavaScript-Developer-I題庫分享: https://www.vcesoft.com/JavaScript-Developer-I-pdf.html
P.S. VCESoft在Google Drive上分享了免費的、最新的JavaScript-Developer-I考試題庫：https://drive.google.com/open?id=1mj-BZW92XbDTVX6x0hA-HrdSfjeWIi1N