[Trắc Nghiệm] 30 câu hỏi trắc nghiệm Javascript - Khoá học lập trình Javascript

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[Trắc Nghiệm] 30 câu hỏi trắc nghiệm Javascript - Khoá học lập trình Javascript

Câu hỏi 1: Which version of ECMAScript was released in June 2023?

A: ES2022 (ES13)
B: ES2023 (ES14)
C: ES2025 (ES16)
D: ES2024 (ES15)

Đáp án: B

Câu hỏi 2: What is the primary benefit of 'Top-level await' introduced in ES2022?

A: It allows using await only inside async functions.
B: It requires a wrapper function for all fetch calls.
C: It allows the use of await outside of async functions in modules.
D: It speeds up the execution of synchronous code.

Đáp án: C

Câu hỏi 3: In ECMAScript 2022, how are private fields in a class prefixed?

A: With an underscore (_)
B: With a dollar sign ($)
C: With a percent sign (%)
D: With a hash prefix (#)

Đáp án: D

Câu hỏi 4: When is a 'static class initialization block' executed?

A: Every time an instance of the class is created.
B: When the class is first loaded by the runtime environment.
C: Only when a static method is called.
D: After the constructor finishes executing.

Đáp án: B

Câu hỏi 5: Which method is a replacement for 'Object.hasOwnProperty()' in ES2022?

A: Object.hasProperty()
B: Object.isOwn()
C: Object.hasOwn()
D: Object.contains()

Đáp án: C

Câu hỏi 6: What does 'Object.hasOwn()' return if a property is inherited rather than being the object's own?

A: true
B: undefined
C: null
D: false

Đáp án: D

Câu hỏi 7: Which keyword is used to define static initialization blocks in a class?

A: init
B: constructor
C: static
D: block

Đáp án: C

Câu hỏi 8: What is the behavior of the ES2023 method 'toSorted()'?

A: It sorts the original array in place.
B: It creates a sorted copy without modifying the original array.
C: It removes duplicate elements while sorting.
D: It only works on arrays of numbers.

Đáp án: B

Câu hỏi 9: Which method should be used to create a reversed copy of an array without changing the original?

A: reverse()
B: toReversed()
C: asReversed()
D: copyReverse()

Đáp án: B

Câu hỏi 10: The 'with(index, value)' method in ES2023 returns:

A: The original array updated at the specific index.
B: A new array with the element at the index replaced by the new value.
C: The length of the new array.
D: The value that was replaced.

Đáp án: B

Câu hỏi 11: What does the 'toSpliced()' method create?

A: A new array with elements added, removed, or replaced at a given index.
B: A shallow copy of the entire array.
C: A string representation of the spliced elements.
D: An iterator for the modified elements.

Đáp án: A

Câu hỏi 12: Which RegExp flag was introduced for match indices in ES2022?

A: /i
B: /g
C: /d
D: /m

Đáp án: C

Câu hỏi 13: What is the purpose of 'Error.cause' in ES2022?

A: To ignore errors in a try-catch block.
B: To provide a property for error chaining.
C: To automatically restart the application on error.
D: To change the error message format.

Đáp án: B

Câu hỏi 14: Which version of ECMAScript is released in June 2025 according to the slides?

A: ES2023
B: ES2024
C: ES2025
D: ES2026

Đáp án: C

Câu hỏi 15: Static initialization blocks in a class are evaluated in which order?

A: Random order
B: Reverse order of declaration
C: Alphabetical order of field names
D: Order of their declaration

Đáp án: D

Câu hỏi 16: In HTML5, which element is used to draw graphics via JavaScript?

A:
B:
C:
D:

Đáp án: C

Câu hỏi 17: The element itself has no drawing abilities; it requires which language to draw?

A: CSS
B: JavaScript
C: PHP
D: C#

Đáp án: B

Câu hỏi 18: Which method is used to specify a new drawing path in Canvas?

A: moveTo()
B: lineTo()
C: stroke()
D: beginPath()

Đáp án: D

Câu hỏi 19: What is the purpose of the 'stroke()' method in Canvas?

A: To define the thickness of the line.
B: To assign a color to the line and display it.
C: To clear the current path.
D: To move the starting point of the line.

Đáp án: B

Câu hỏi 20: Which method is used to draw a rectangle with the existing fill style?

A: drawRect()
B: fillRect()
C: strokeRect()
D: rect()

Đáp án: B

Câu hỏi 21: To draw a circle using the 'arc()' method, the end angle must be specified as:

A: PI
B: 180 degrees
C: 2 * Math.PI
D: 90 degrees

Đáp án: C

Câu hỏi 22: How many control points are used to represent Bezier curves in Canvas?

A: One
B: Two
C: Three
D: Zero

Đáp án: B

Câu hỏi 23: Which method is used to draw image objects on a canvas?

A: paintImage()
B: showImage()
C: drawImage()
D: putImage()

Đáp án: C

Câu hỏi 24: Which property is used to set the text color in a canvas?

A: color
B: fontColor
C: fillStyle
D: strokeStyle

Đáp án: C

Câu hỏi 25: The jQuery 'hover()' function accepts how many parameters?

A: One
B: Two
C: Three
D: Four

Đáp án: B

Câu hỏi 26: Which HTML5 tag is used to include external content and follows a 'push model'?

A:
B:
C:
D:

Đáp án: C

Câu hỏi 27: What is the maximum amount of information that Web Storage can store per domain?

A: 4 KB
B: 1 MB
C: 5 MB
D: 10 MB

Đáp án: C

Câu hỏi 28: Where is Web Storage data available?

A: On the server-side only
B: On both client and server sides
C: On the client-side only
D: In the cloud only

Đáp án: C

Câu hỏi 29: Which of the following is a type of HTML5 Web Storage?

A: Cookie storage
B: Session storage
C: Temp storage
D: Cache storage

Đáp án: B

Câu hỏi 30: To check for browser support of Web Storage, which global variable can be used?

A: webStorage
B: localStorage
C: dbStorage
D: clientStorage

Đáp án: B

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