Rosetta Code Sieve of Eratosthenes ExampleFrom rosettacode.org:
[The following task description was taken from rosettacode.org:]
Implement the Sieve of Eratosthenes algorithm, with the only allowed optimization that the outer loop can stop at the square root of the limit, and the inner loop may start at the square of the prime just found.
That means especially that you shouldn't optimize by using pre-computed wheels, i.e. don't assume you need only to cross out odd numbers (wheel based on 2), numbers equal to 1 or 5 modulo 6 (wheel based on 2 and 3), or similar wheels based on low primes.
If there's an easy way to add such a wheel based optimization, implement it as an alternative version.
Using Sequences and Filters
Using PipesPipes are just an syntax equivalent for feature
Sequence.for_eachusing the infix operator
|to apply code to all elements in the sequence. Infix operator
&can be used to filter elements.
Purely functional implementation using ps_set
ps_set is a persistent set data structure in Fuzion's standard library with well-behaved cumulative and average performance:
Purely functional implementation using bitsets
bitset is a persistent data structure in Fuzion's standard library that (currently) does not have good cumulative or average performance: