@tonaljs/array/dist/index.mjs

Functions to work with arrays of tonal objects

// index.ts
import { note } from "@tonaljs/pitch-note";
function ascR(b, n) {
  const a = [];
  for (; n--; a[n] = n + b) ;
  return a;
}
function descR(b, n) {
  const a = [];
  for (; n--; a[n] = b - n) ;
  return a;
}
function range(from, to) {
  return from < to ? ascR(from, to - from + 1) : descR(from, from - to + 1);
}
function rotate(times, arr) {
  const len = arr.length;
  const n = (times % len + len) % len;
  return arr.slice(n, len).concat(arr.slice(0, n));
}
function compact(arr) {
  return arr.filter((n) => n === 0 || n);
}
function sortedNoteNames(notes) {
  const valid = notes.map((n) => note(n)).filter((n) => !n.empty);
  return valid.sort((a, b) => a.height - b.height).map((n) => n.name);
}
function sortedUniqNoteNames(arr) {
  return sortedNoteNames(arr).filter((n, i, a) => i === 0 || n !== a[i - 1]);
}
function shuffle(arr, rnd = Math.random) {
  let i;
  let t;
  let m = arr.length;
  while (m) {
    i = Math.floor(rnd() * m--);
    t = arr[m];
    arr[m] = arr[i];
    arr[i] = t;
  }
  return arr;
}
function permutations(arr) {
  if (arr.length === 0) {
    return [[]];
  }
  return permutations(arr.slice(1)).reduce((acc, perm) => {
    return acc.concat(
      arr.map((e, pos) => {
        const newPerm = perm.slice();
        newPerm.splice(pos, 0, arr[0]);
        return newPerm;
      })
    );
  }, []);
}
export {
  compact,
  permutations,
  range,
  rotate,
  shuffle,
  sortedNoteNames,
  sortedUniqNoteNames
};
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