Prime Generator in Dlang

app.d

import std.stdio;
import std.range;
import std.algorithm;

auto primeGenerator() {
    int num = 2;
    
    return generate(() {
        while (true) {
            if (isPrime(num)) {
                return num++;
            }
            
            num++;
        }
    });
}

bool isPrime(int num) {
    if (num <= 1) return false;
    
    for (int i = 2; i * i <= num; i++) {
        if (num % i == 0) return false;
    }
    
    return true;
}

void main() {
  const LIMIT = 100;
  writeln(primeGenerator.until!(n => (n >= LIMIT)));
}