@absmartly/javascript-sdk/es/assigner.js

A/B Smartly Javascript SDK

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.VariantAssigner = void 0;
const utils_1 = require("./utils");
const murmur3_32_1 = require("./murmur3_32");
class VariantAssigner {
  constructor(unit) {
    this._unitHash = (0, murmur3_32_1.murmur3_32)((0, utils_1.stringToUint8Array)(unit).buffer);
  }
  assign(split, seedHi, seedLo) {
    const prob = this._probability(seedHi, seedLo);
    return (0, utils_1.chooseVariant)(split, prob);
  }
  _probability(seedHi, seedLo) {
    const key = this._unitHash;
    const buffer = new ArrayBuffer(12);
    const view = new DataView(buffer);
    view.setUint32(0, seedLo, true);
    view.setUint32(4, seedHi, true);
    view.setUint32(8, key, true);
    return (0, murmur3_32_1.murmur3_32)(buffer) * (1.0 / 0xffffffff);
  }
}
exports.VariantAssigner = VariantAssigner;