veffect/node_modules/effect/dist/cjs/internal/random.js

powerful TypeScript validation library built on the robust foundation of Effect combining exceptional type safety, high performance, and developer experience. Taking inspiration from Effect's functional principles, VEffect delivers a balanced approach tha

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.randomTag = exports.make = exports.RandomTypeId = void 0;
var Chunk = /*#__PURE__*/_interopRequireWildcard( /*#__PURE__*/require("../Chunk.js"));
var Context = /*#__PURE__*/_interopRequireWildcard( /*#__PURE__*/require("../Context.js"));
var _Function = /*#__PURE__*/require("../Function.js");
var PCGRandom = /*#__PURE__*/_interopRequireWildcard( /*#__PURE__*/require("../Utils.js"));
var core = /*#__PURE__*/_interopRequireWildcard( /*#__PURE__*/require("./core.js"));
function _getRequireWildcardCache(e) {
  if ("function" != typeof WeakMap) return null;
  var r = new WeakMap(),
    t = new WeakMap();
  return (_getRequireWildcardCache = function (e) {
    return e ? t : r;
  })(e);
}
function _interopRequireWildcard(e, r) {
  if (!r && e && e.__esModule) return e;
  if (null === e || "object" != typeof e && "function" != typeof e) return {
    default: e
  };
  var t = _getRequireWildcardCache(r);
  if (t && t.has(e)) return t.get(e);
  var n = {
      __proto__: null
    },
    a = Object.defineProperty && Object.getOwnPropertyDescriptor;
  for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) {
    var i = a ? Object.getOwnPropertyDescriptor(e, u) : null;
    i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u];
  }
  return n.default = e, t && t.set(e, n), n;
}
/** @internal */
const RandomSymbolKey = "effect/Random";
/** @internal */
const RandomTypeId = exports.RandomTypeId = /*#__PURE__*/Symbol.for(RandomSymbolKey);
/** @internal */
const randomTag = exports.randomTag = /*#__PURE__*/Context.GenericTag("effect/Random");
/** @internal */
class RandomImpl {
  seed;
  [RandomTypeId] = RandomTypeId;
  PRNG;
  constructor(seed) {
    this.seed = seed;
    this.PRNG = new PCGRandom.PCGRandom(seed);
  }
  get next() {
    return core.sync(() => this.PRNG.number());
  }
  get nextBoolean() {
    return core.map(this.next, n => n > 0.5);
  }
  get nextInt() {
    return core.sync(() => this.PRNG.integer(Number.MAX_SAFE_INTEGER));
  }
  nextRange(min, max) {
    return core.map(this.next, n => (max - min) * n + min);
  }
  nextIntBetween(min, max) {
    return core.sync(() => this.PRNG.integer(max - min) + min);
  }
  shuffle(elements) {
    return shuffleWith(elements, n => this.nextIntBetween(0, n));
  }
}
const shuffleWith = (elements, nextIntBounded) => {
  return core.suspend(() => (0, _Function.pipe)(core.sync(() => Array.from(elements)), core.flatMap(buffer => {
    const numbers = [];
    for (let i = buffer.length; i >= 2; i = i - 1) {
      numbers.push(i);
    }
    return (0, _Function.pipe)(numbers, core.forEachSequentialDiscard(n => (0, _Function.pipe)(nextIntBounded(n), core.map(k => swap(buffer, n - 1, k)))), core.as(Chunk.fromIterable(buffer)));
  })));
};
const swap = (buffer, index1, index2) => {
  const tmp = buffer[index1];
  buffer[index1] = buffer[index2];
  buffer[index2] = tmp;
  return buffer;
};
const make = seed => new RandomImpl(seed);
exports.make = make;
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