Function func

Produce a value from a callback. When the callback returns undefined it is considered done.

const callback = () => Math.random();

const f = Chains.From.func(callback);
for await (const v of f) {
 // v is a new random number
}
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In the context of a chain:

let produced = 0;
const chain = Chains.chain<number, string>(
 // Produce incrementing numbers
 Chains.From.func(() => produced++),
 // Convert to `x:0`, `x:1` ...
 Chains.transform(v => `x:${ v }`),
 // Take first 5 results
 Chains.cap(5)
);
const data = await Chains.asArray(chain);
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