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Topic: Debugging & Code Output
π 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())Why is wrapping both UPDATEs in a single transaction important here?
Topic: SQL
π 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;Topic: Debugging & Code Output
π Quick look before the question:
for i in range(5):
if i == 3:
continue
print(i)Topic: Java
π 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);
}
}What is a key difference between arrow functions and regular functions regarding 'this'?
Which collection interface in Java does not allow duplicate elements?
Why might explaining your algorithm's time and space complexity unprompted be a good habit in a coding interview?
What does idempotent mean for a function or operation, outside the specific API context?
Why might an interviewer intentionally give you an ambiguous or underspecified problem?
Topic: Debugging & Code Output
π Quick look before the question:
def modify(lst):
lst.append(100)
lst = [1, 2, 3]
lst.append(200)
original = [0]
modify(original)
print(original)