algo-uniqueid/src/utils.ts

A lightweight and customizable TypeScript library for generating unique identifiers, secure passwords, and validating SSL certificates. Supports custom formats, batch generation, checksum validation, and built-in SSL certificate checks—perfect for order I

export const defaultCharset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';

/**
 * Generates a random string of specified length using the provided charset
 * @param length Length of the string to generate
 * @param charset Characters to use in the random string
 * @returns Random string
 */
export function generateRandomString(length: number, charset: string): string {
  let result = '';
  const charactersLength = charset.length;
  
  for (let i = 0; i < length; i++) {
    result += charset.charAt(Math.floor(Math.random() * charactersLength));
  }
  
  return result;
}

/**
 * Computes a single-character checksum for the given input string
 * @param input String to compute checksum for
 * @returns Single character checksum
 */
export function computeChecksum(input: string): string {
  // Simple implementation - compute a hash and convert to a single character
  let hash = 0;
  
  for (let i = 0; i < input.length; i++) {
    const char = input.charCodeAt(i);
    hash = ((hash << 5) - hash) + char;
    hash = hash & hash; // Convert to 32bit integer
  }
  
  // Get absolute value and mod by 36 to get a single alphanumeric character
  const charCode = Math.abs(hash) % 36;
  
  // Convert to a single character (0-9, A-Z)
  return charCode < 10 
    ? charCode.toString() 
    : String.fromCharCode(charCode - 10 + 65);
}