@dillonkearns/elm-graphql/examples/src/subscription/node_modules/flow-static-land/lib/Random.js

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.RANDOM = undefined;
exports.random = random;
exports.randomInt = randomInt;
exports.randomRange = randomRange;
exports.randomBool = randomBool;

var _Eff = require('./Eff');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

// The `RANDOM` effect indicates that an Eff action may access or modify the
// JavaScript global random number generator, i.e. `Math.random()`.
var RANDOM = exports.RANDOM = function RANDOM() {
  _classCallCheck(this, RANDOM);
};

function random() {
  return (0, _Eff.inj)(function () {
    return Math.random();
  });
}

// Returns a random integer between min (included) and max (included)
function randomInt(min, max) {
  var lo = Math.ceil(min);
  var hi = Math.floor(max);
  return (0, _Eff.map)(function (n) {
    return Math.floor(n * (hi - lo + 1)) + lo;
  }, random());
}

// Returns a random number between a minimum value (inclusive) and a maximum value (exclusive)
function randomRange(min, max) {
  return (0, _Eff.map)(function (n) {
    return Math.floor(n * (max - min)) + min;
  }, random());
}

// Returns a random boolean value with an equal chance of being `true` or `false`
function randomBool() {
  return (0, _Eff.map)(function (n) {
    return n < 0.5;
  }, random());
}