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| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts |
| Browsers and Events | 17% | - Window and document object properties - Document Object Model (DOM) manipulation - Script loading and execution order - Browser APIs and Web Storage - Event handling, propagation, and delegation |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Truthy and falsy values - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
| Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Async/await syntax - Promises and chaining - Fetch API and HTTP requests - Event loop and micro/macro tasks |
| Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Modules and imports/exports - Decorators and advanced function patterns - Function definitions, parameters, and scope - Closures and execution context |
>> JavaScript-Developer-I復習範囲 <<
CertJukenのJavaScript-Developer-I問題集は素晴らしい参考資料です。この問題集は絶対あなたがずっと探しているものです。これは受験生の皆さんのために特別に作成し出された試験参考書です。この参考書は短い時間で試験に十分に準備させ、そして楽に試験に合格させます。試験のためにあまりの時間と精力を無駄にしたくないなら、CertJukenのJavaScript-Developer-I問題集は間違いなくあなたに最もふさわしい選択です。この資料を使用すると、あなたの学習効率を向上させ、多くの時間を節約することができます。
質問 # 27
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
正解：A
質問 # 28
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?
正解：B
解説：
質問 # 29
Refer to the code below:
01 const server = require( ' server ' );
02
03 // Insert code here
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
正解：D
解説：
The question specifies:
* The library "uses events and callbacks to start the server".
* We want to "set up an event and start the web server".
Option C:
server((port) = > { console.log( ' Listening on ' , port); });
This:
* Calls server(...), which (by design in such libraries) typically starts the web server.
* Passes a callback function that receives port when the server is ready.
* Inside the callback, it logs " Listening on < port > " .
This matches the "events and callbacks" description: the callback is invoked when the server has started listening.
Why others are incorrect:
* A. server.on( ' connect ' , ...)
* Assumes server is an event emitter instance with a ' connect ' event, which is not given. Also, this line alone would not start the server.
* B. server.start();
* Assumes a start method exists; the question says the library "uses events and callbacks to start," implying invocation with a callback, not a plain start() call.
* D. server();
* Might start the server, but does not "set up an event" or callback to know when or where it is listening.
Therefore, C aligns with the described usage.
Concepts: callback-based APIs, starting servers with callbacks, event/callback style vs simple method calls.
質問 # 30
A developer is asked to fix some bugs reported by users. To do that, the developer adds
a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are
available in the browser console ?
Choose 2 answers:
正解：B、C
質問 # 31
Which two options are core Node.js modules?
Choose 2 answers
正解：A、C
質問 # 32
......
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