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Estimate new values between existing ones.
Similar: interleave, intermix, interpolate, intersperse.
function interpolate(x, fc) // x: an array // fc: combine function (a, b)
const xarray = require('extra-array'); var x = [1, 2, 3]; xarray.interpolate(x, (a, b) => (a + b)/2); // → [ 1, 1.5, 2, 2.5, 3 ]