Interesting Code Snippets: No‑Code Project, Shuffle Algorithm, Sleep Sort, Simple AI Loop, Fast Inverse Square Root and More

1. No code

Project address: https://github.com/kelseyhightower/nocode . This GitHub repository, currently with 34k stars, claims to provide a fully automatic, cross‑platform tool that requires no source code to deploy, compile, package, install, and run.

2. Shuffle algorithm

The following two‑line code generates a uniformly random permutation of n elements, ensuring each element has equal probability of appearing in any position.

for(int i = n - 1; i >= 0; i--)
// rand(0, i) generates a random integer in [0, i]
swap(arr[i], arr[rand(0, i)])

3. Sleep sort

This method creates n threads, each associated with one of the numbers to be sorted; each thread sleeps for a duration proportional to its number and then prints the number, resulting in an ordered output.

public class SleepSort {
public static void main(String[] args) {
int[] ints = {1,4,7,3,8,9,2,6,5};
SortThread[] sortThreads = new SortThread[ints.length];
for(int i = 0; i < sortThreads.length; i++) {
sortThreads[i] = new SortThread(ints[i]);
}
for(int i = 0; i < sortThreads.length; i++) {
sortThreads[i].start();
}
}
}
class SortThread extends Thread {
int ms = 0;
public SortThread(int ms) { this.ms = ms; }
public void run() {
try { sleep(ms*10+10); } catch(InterruptedException e) { e.printStackTrace(); }
System.out.println(ms);
}
}

4. AI core code

A minimal interactive loop that reads input, removes Chinese question particles, and prints the transformed string; presented as a “billion‑yuan AI core” example.

while True:
print(input('').replace('吗','').replace('？','！'))

5. Get next‑day time

Simple Java snippet that pauses the current thread for one day.

// talent talent
thread.sleep(86400*1000L);

6. 0x5f375a86

The article discusses the famous fast inverse‑square‑root constant used in graphics engines (originally 0x5f3759df) and mentions alternative values such as 0x5f37642f and 0x5f375a86, referencing the underlying algorithm and its mysterious origin.

7. Hello world

Every programmer eventually writes a “Hello World” program, regardless of language.