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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Server-Side JavaScript | 8% | - Core Node.js modules - Command-line tools and scripts - Module system and require/import - Node.js fundamentals and runtime |
| Topic 2: Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Closures and execution context - Modules and imports/exports - Decorators and advanced function patterns - Object creation, properties, and methods - Class syntax, inheritance, and prototypes |
| Topic 3: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Async/await syntax - Event loop and micro/macro tasks - Promises and chaining - Callbacks and callback hell |
| Topic 4: Variables, Types, and Collections | 23% | - Variable declaration and initialization - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Truthy and falsy values |
| Topic 5: Testing | 7% | - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts - Code coverage and best practices |
| Topic 6: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
| Topic 7: Browsers and Events | 17% | - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Script loading and execution order - Window and document object properties - Event handling, propagation, and delegation |
>> JavaScript-Developer-I合格記 <<
実際に、多くの受験者はJavaScript-Developer-I試験に合格したいです。難しいですが、自分自身はより良いものになりたいので、やはりチャレンジしたいです。そのような場合、JavaScript-Developer-I学習教材のようないい資料が必要です。JavaScript-Developer-I学習教材を利用すれば、あなたはJavaScript-Developer-I試験を簡単にパスできます。
質問 # 104
Refer to the HTML below:
< div id= " main " >
< ul >
< li > Leo < /li >
< li > Tony < /li >
< li > Tiger < /li >
< /ul >
< /div >
Which JavaScript statement results in changing " Leo " to " The Lion " ?
正解：A
解説：
We want to select the first < li > under #main and change its content.
* document.querySelector(selector) returns the first element matching the CSS selector.
* In the DOM, the < li > elements under < ul > are children in order:
* 1st child: " Leo "
* 2nd child: " Tony "
* 3rd child: " Tiger "
li:nth-child(1) is the CSS pseudo-class that selects the first < li > inside its parent.
So:
document.querySelector( ' #main li:nth-child(1) ' ).innerHTML = ' The Lion ' ; selects the first < li > ( " Leo " ) inside #main and sets its innerHTML to " The Lion " .
Why others are incorrect:
* A. #main #Leo
* There is no element with id " Leo " . id is not set on the < li > , so the selector matches nothing.
* B. li:second-child
* There is no :second-child pseudo-class. The valid pseudo-class is :nth-child(2); and that would select " Tony " , not " Leo " .
* C. ' #main li,Leo '
* This selector means "all #main li and all elements named < Leo > ".
* There is no < Leo > tag, and querySelectorAll returns a NodeList, which does not have a single innerHTML property.
Therefore, D is the correct statement.
Study Guide Concepts:
* document.querySelector vs querySelectorAll
* CSS selectors: nth-child()
* DOM element innerHTML property
質問 # 105
Refer to the code below:
let sayHello = () => {
console.log ('Hello, world!');
};
Which code executes sayHello once, two minutes from now?
正解：B
質問 # 106
Teams at Universal Containers (CU) work on multiple JavaScript projects at the same time. UC us thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?
正解：B
質問 # 107
Referto the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() =>console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
正解：C
質問 # 108
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information thedeveloper has, which code logs an error at boost with an event?
正解：B
質問 # 109
......
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