Function streamWithContext

Example

const s = Normalise.streamWithContext();
s.seen(2);    // 1 (because 2 is highest seen)
s.seen(1);    // 0 (because 1 is the lowest so far)
s.seen(1.5);  // 0.5 (50% of range 1-2)
s.seen(0.5);  // 0 (because it's the new lowest)
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And the more advanced features

s.min / s.max / s.range
s.reset();
s.reset(10, 100);
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