Function interpolatorInterval

Interpolates between A->B over duration. Given the same A & B values, steps will be larger if it's a longer duration, and shorter if it's a smaller duration.

A function is returned, which when invoked yields a value between A..B.

Alternatively to step through by the same amount regardless of time, use interpolatorStepped.

// Interpolate from 0..1 over one minute
const v = interpolatorInterval({mins:1});
v(); // Compute current value
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Use start and end points:

// Interpolate from 100-200 over 10 seconds
const v = interpolatorInterval({secs:10}, 100, 200);
v(); // Compute current value
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