pseudo-random-data-generator-demo

cell0.js

import faker from "https://cdn.jsdelivr.net/npm/@faker-js/faker@6.0.0-alpha.3/dist/faker.min.js"; ///**import and configure faker**
faker.locales[faker.locale].name.male_prefix = ["Mr.", "Dr."];
faker.locales[faker.locale].name.female_prefix = ["Mrs.", "Miss.", "Dr."];
window.faker = faker;

cell1.js

({ ///**Generate some fake data**
    name: faker.name.firstName(1),
    age: faker.datatype.number() % 100
});

cell2.js

faker.seed(50); ///**Make it repeatable**
({
    name: faker.name.firstName(1),
    age: faker.datatype.number() % 100
});

cell3.js

const SEED_VALUE = 50; ///**The Problem**

faker.seed(SEED_VALUE);
({
    name: faker.name.firstName(1),
    age: faker.datatype.number() % 100
});

faker.seed(SEED_VALUE);
({
    name: faker.name.firstName(1),
    title: faker.name.prefix(1),
    age: faker.datatype.number() % 100
});

cell4.js

const seededFaker = getSeededFaker(50); ///**Consistently repeatable values**
({ ///**Unique address for data items**
  name: seededFaker("NAME").name.firstName(1),
  age: seededFaker("AGE").datatype.number() % 100,
});

({ ///**Adding item does not change other values**
  name: seededFaker("NAME").name.firstName(1),
  title: seededFaker("TITLE").name.prefix(1),
  age: seededFaker("AGE").datatype.number() % 100,
});

cell5.js

new Array(500).fill(null).map((_, index) => { ///**Generate lots of data**
  const seededFaker = getSeededFaker(index);
  return {
    name: seededFaker("NAME").name.firstName(1),
    title: seededFaker("TITLE").name.prefix(1),
    age: seededFaker("AGE").datatype.number() % 100,
    iban: seededFaker("iban").finance.iban(),
    bitcoin: seededFaker("bitcoin").finance.bitcoinAddress(),
  }
});

cell6.js

// hash function to convert string into integer ///**The Solution**
const murmurHash3 = (str) => {
  for (var i = 0, h = 1779033703 ^ str.length; i < str.length; i++) {
    h = Math.imul(h ^ str.charCodeAt(i), 3432918353);
    h = h << 13 | h >>> 19;
  }
  h = Math.imul(h ^ (h >>> 16), 2246822507);
  h = Math.imul(h ^ (h >>> 13), 3266489909);
  return (h ^= h >>> 16) >>> 0;
}

// return faker instance that combines seed and path
const getSeededFaker = (seed) =>
  (path) => {
    const seededPathString = JSON.stringify([seed, path]);
    const seedNumber = murmurHash3(seededPathString);
    faker.seed(seedNumber);
    return faker;
  };

window.murmurHash3 = murmurHash3
window.getSeededFaker = getSeededFaker

cell7.js

const seededFaker = getSeededFaker(50); ///**Populate system with consistent data**

const user = {
  name: seededFaker("NAME").name.firstName(1),
  title: seededFaker("TITLE").name.prefix(1),
  age: seededFaker("AGE").datatype.number() % 100,
};

`INSERT INTO users (name, title, age) VALUES ('${user.name}', '${user.title}', ${user.age});`;

`injectIntoLDAP("${user.name}", "${user.title}");`;

cell8.js

const seededFaker = getSeededFaker(37); ///**Generate data for cucumber tests**
const test = `
Feature: Welcoming Login
  As a user
  I want to be greeted upon login
  So that I can feel warm and fuzzy inside

  Scenario: Login to app
    Given I register user with email "${seededFaker("NAME").name.firstName(1).toLowerCase()}@example.com" and password "${seededFaker("PASSWORD").internet.password()}"
    And I navigate to "/login"
    When I input "${seededFaker("NAME").name.firstName(1).toLowerCase()}@example.com" into email form input
    And I input "${seededFaker("PASSWORD").internet.password()}" into password form input
    And I press the login button
    Then I expect the title to be "Hello ${seededFaker("NAME").name.firstName(1)}, have a nice day!"
`;

cell9.js

const seededFaker = getSeededFaker(50); ///**Develop new feature**
const user = {
  name: seededFaker("NAME").name.firstName(1),
  title: seededFaker("TITLE").name.prefix(1),
  age: seededFaker("AGE").datatype.number() % 100,
  iban: seededFaker("iban").finance.iban(),
  bitcoin: seededFaker("bitcoin").finance.bitcoinAddress(),
};

pseudo-random-data-generator-demo.carbide.md

pseudo-random-data-generator-demo

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