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2023-03-02
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import ascending from "./ascending.js";
import {ascendingDefined, compareDefined} from "./sort.js";
export default function rank(values, valueof = ascending) {
if (typeof values[Symbol.iterator] !== "function") throw new TypeError("values is not iterable");
let V = Array.from(values);
const R = new Float64Array(V.length);
if (valueof.length !== 2) V = V.map(valueof), valueof = ascending;
const compareIndex = (i, j) => valueof(V[i], V[j]);
let k, r;
Uint32Array
.from(V, (_, i) => i)
.sort(valueof === ascending ? (i, j) => ascendingDefined(V[i], V[j]) : compareDefined(compareIndex))
.forEach((j, i) => {
const c = compareIndex(j, k === undefined ? j : k);
if (c >= 0) {
if (k === undefined || c > 0) k = j, r = i;
R[j] = r;
} else {
R[j] = NaN;
}
});
return R;
}