Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
Published
Edited
Sep 22, 2021
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function samples(array, m) {
if (!((m = Math.floor(m)) > 0)) return []; // return nothing
const n = array.length;
if (!(n > m)) return [...array]; // return everything
if (m === 1) return [array[n >> 1]]; // return the midpoint
return Array.from({length: m}, (_, i) => array[Math.round(i / (m - 1) * (n - 1))]);
}
samples(array, m) // m evenly-spaced samples
array = Array.from({length: 1000}, (_, i) => i) // fake source data
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