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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browsers and Events | 17% | - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Script loading and execution order |
| Topic 2: Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Decorators and advanced function patterns - Closures and execution context - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Modules and imports/exports |
| Topic 3: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Promises and chaining - Callbacks and callback hell - Event loop and micro/macro tasks - Async/await syntax |
| Topic 4: Debugging and Error Handling | 7% | - Defensive programming practices - Error types and exception handling - Console methods and logging - Debugging tools and breakpoints |
| Topic 5: Variables, Types, and Collections | 23% | - JSON parsing and usage - Array methods and data manipulation - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Type coercion and conversion rules |
| Topic 6: Server-Side JavaScript | 8% | - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules |
| Topic 7: Testing | 7% | - Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts |
>> JavaScript-Developer-Iトレーニング資料 <<
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質問 # 119
Refer to the following code:
<html lang="en">
<body>
<divonclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?
正解:C
質問 # 120
A developer writes the code below to calculate the factorial of a given number function sum(number){ return number * sum(number-1);
}
sum(3);
what is the result of executing the code.
正解:A
質問 # 121
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?
正解:A
質問 # 122
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?
正解:A、B、D
質問 # 123
A developer receives a comment from the Tech lead that the code below gives an error.
Which line edit should be made to make this code run?
正解:C
質問 # 124
......
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