Blookly trắc nghiệm 10 - Phan Thủy
Authored by thuy phan
Computers
9th - 12th Grade
Used 7+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1. What is the result of the following expression?
A. true
B. false
C. undefined
D. Error
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2. Which of the following syntax is used to copy an object in JavaScript?
A. let newObj = oldObj.clone();
B. let newObj = Object.assign({}, oldObj);
C. let newObj = Object.copy(oldObj);
D. let newObj = oldObj;
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
3. In JavaScript, what is the async keyword used for?
A. Declare an asynchronous function
B. Pause a synchronous function
C. Terminate an asynchronous function
D. Start a new process
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4. What is the result of the following expression?
A. 30
B. undefined
C. null
D. Error
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
5. What is the correct syntax to use the reduce function to sum elements in an array?
A. arr.reduce((a, b) => a + b);
B. arr.reduce((a, b) => a + b, 0);
C. arr.reduce((total, value) => total + value);
D. arr.reduce((total, value) => total + value, 0);
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
6. What is the result of the following expression?
A. true
B. false
C. undefined
D. null
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
7. What is the result of the following expression?
A. true
B. false
C. undefined
D. Error
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