quaeratin/node/double-expansion/e-to-double-double.js

An extended precision floating point library (as per Shewchuk) - precision only limited by overflow / underflow

import { eCompress } from "./e-compress.js";
// We *have* to do the below❗ The assignee is a getter❗ The assigned is a pure function❗
const compress = eCompress;
/**
 * Returns the result of converting a floating point expansion to a
 * double-double precision floating point number.
 */
function eToDd(e) {
    e = compress(e);
    const len = e.length;
    if (len === 2) {
        return e; // already a double-double
    }
    else if (len === 1) {
        return [0, e[0]]; // double-doubles have a fixed length of 2
    }
    return [e[len - 2], e[len - 1]]; // return only most significant parts
}
export { eToDd };
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