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Programming quizzes and knowledge tests Short quizzes on programming, logic and computer science. Test and improve your coding knowledge. Join 👉 https://rebrand.ly/bigdatachannels DMCA: @disclosure_bds Contact: @mldatascientist
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频道帖子
What is the primary advantage of a hash map over a balanced binary search tree for key-value storage?
| 2 | What does the 'volatile' keyword guarantee for a Java field? | 31 |
| 3 | What does this print, in order? | 136 |
| 4 | Topic: Python
🔍 Quick look before the question:
def outer():
x = 10
def inner():
nonlocal x
x += 5
return x
return inner
f = outer()
print(f())
print(f()) | 130 |
| 5 | What is a primary key's main purpose in a relational table? | 176 |
| 6 | Which of these creates a shallow copy of a list in Python? | 62 |
| 7 | What is the practical difference between Object.is(NaN, NaN) and NaN === NaN? | 56 |
| 8 | Which isolation level allows a transaction to read data another concurrent transaction has written but not yet committed? | 586 |
| 9 | What does this print? | 66 |
| 10 | Topic: Debugging & Code Output
🔍 Quick look before the question:
def outer():
result = []
for i in range(3):
def inner():
return i
result.append(inner)
return [f() for f in result]
print(outer()) | 58 |
| 11 | Why is wrapping both UPDATEs in a single transaction important here? | 69 |
| 12 | Topic: SQL
🔍 Quick look before the question:
BEGIN TRANSACTION;
UPDATE accounts SET balance = balance - 200 WHERE id = 1;
UPDATE accounts SET balance = balance + 200 WHERE id = 2;
COMMIT; | 69 |
| 13 | What gets printed? | 76 |
| 14 | Topic: Debugging & Code Output
🔍 Quick look before the question:
for i in range(5):
if i == 3:
continue
print(i) | 78 |
| 15 | In Python, what is the result of 3 ** 2? | 84 |
| 16 | What does Array.prototype.map() return? | 285 |
| 17 | What does the SQL DISTINCT keyword do? | 97 |
| 18 | What will counter reliably print, and why? | 106 |
| 19 | Topic: Java
🔍 Quick look before the question:
public class Test {
static int counter = 0;
static synchronized void increment() {
counter++;
}
public static void main(String[] args) throws InterruptedException {
Thread t1 = new Thread(() -> {
for (int i = 0; i < 1000; i++) increment();
});
Thread t2 = new Thread(() -> {
for (int i = 0; i < 1000; i++) increment();
});
t1.start(); t2.start();
t1.join(); t2.join();
System.out.println(counter);
}
} | 89 |
| 20 | Which Python keyword defines a named function? | 91 |
