fabricatorjs/src/alpha.js

Generate fake test data

function getRandomNumber(min, max) {
  return (Math.random() * ((max - min) + 1)) + min;
}

export default class Alphanumeric {
  constructor(lang = 'us') {
    this.lang = lang;
  }

  randomNumber({ min = 0, max = 1000 } = {}) {
    return Math.floor(getRandomNumber(min, max));
  }

  randomFloat({ min = 0, max = 1000, precision = 5 } = {}) {
    return (getRandomNumber(min, max)).toPrecision(precision);
  }

  listOfRandomNumbers({ amount = 100, min = 0, max = 1000 } = {}) {
    return new Array(amount).fill(this.randomNumber({ min, max }));
  }

  listOfRandomFloats({ amount = 100, min = 0, max = 1000, precision = 5 } = {}) {
    return new Array(amount).fill(this.randomFloat({ min, max, precision }));
  }

  string({ from = '0123456789abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_',
  max = 30 } = {}) {
    const charsArray = [];
    for (let index = 0; index < max; index++) {
      charsArray.push(from[this.randomNumber({ max: from.length - 1 })]);
    }
    return charsArray.join('');
  }

  letterify(pattern) {
    return pattern.replace(/\?/g, this.string({ max: 1 }));
  }

  numerify(pattern) {
    return pattern.replace(/#/g, this.randomNumber({ max: 9 }));
  }

  botify(pattern) {
    return this.letterify(this.numerify(pattern));
  }

  randomHash(length = 40) {
    return this.string({ from: '0123456789abcdef', max: length });
  }

  randomGuid(version = 5) {
    const guidPool = 'abcdef1234567890';
    const variantPool = 'ab89';
    return `${this.string({ from: guidPool, max: 8 })}-` +
      `${this.string({ from: guidPool, max: 4 })}-` +
      `${version}` +
      `${this.string({ from: guidPool, max: 3 })}-` +
      `${this.string({ from: variantPool, max: 1 })}` +
      `${this.string({ from: guidPool, max: 3 })}-` +
      `${this.string({ from: guidPool, max: 12 })}`;
  }
}