atriusmaps-node-sdk/dist/cjs/src/utils/rand.js

This project provides an API to Atrius Personal Wayfinder maps within a Node environment. See the README.md for more information

'use strict';

function mulberry32(seed) {
  return function() {
    let t = seed += 1831565813;
    t = Math.imul(t ^ t >>> 15, t | 1);
    t ^= t + Math.imul(t ^ t >>> 7, t | 61);
    return ((t ^ t >>> 14) >>> 0) / 4294967296;
  };
}
const random = undefined?.MODE === "test" ? mulberry32(12345678) : Math.random;
const rand = (min, max) => {
  if (max == null) {
    max = min;
    min = 0;
  }
  return Math.floor(random() * (max - min) + min);
};
function randomSet(size, max) {
  if (!max) {
    max = size;
  }
  if (size > max) {
    size = max;
  }
  const result = [];
  const SPARSITY_THRESHOLD = 0.3;
  const isSparse = size / max < SPARSITY_THRESHOLD;
  if (isSparse) {
    const seen = /* @__PURE__ */ new Set();
    while (result.length < size) {
      const i = rand(max);
      if (!seen.has(i)) {
        seen.add(i);
        result.push(i);
      }
    }
  } else {
    const source = Array.from({ length: max }, (_, i) => i);
    for (let i = 0; i < size; i++) {
      const index = rand(max - i);
      result.push(source[index]);
      source[index] = source[max - i - 1];
    }
  }
  return result;
}
const getMappedArray = (array, map) => map.map((i) => array[i]);
const randomizeArray = (array) => getMappedArray(array, randomSet(array.length));
const arrayPick = (array, num = 1) => getMappedArray(array, randomSet(num, array.length));

exports.arrayPick = arrayPick;
exports.rand = rand;
exports.randomSet = randomSet;
exports.randomizeArray = randomizeArray;