Function repeat

This generator will repeat another generator up until some condition. This is the version that can handle async generators.

For example, @ixfx/numbers.count will count from 0..number and then finish:

import { count } from '@ixfx/numbers'
for (const v of count(5)) {
 // v: 0, 1, 2, 3, 4
}
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But what if we want to repeat the count? We have to provide a function to create the generator, rather than using the generator directly, since it's "one time use"

for await (const v of repeat(() => count(5))) {
 // v: 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, ...
 // warning: never ends
}
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Limiting the number of repeats can be done by passing in extra parameters

repeat(generator, { count: 5} ); // Iterate over `generator` five times
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const ac = new AbortController();
repeat(generator, { signal: ac.signal }); // Pass in signal
...
ac.abort(); // Trigger signal at some point
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