excel-builder-vanilla/src/utilities/uniqueId.ts

An easy way of building Excel files with javascript

/** Lodash Util - Used to generate unique IDs. */
const idCounter: { [prefix: string]: number } = {};

/**
 * Generates a unique ID. If `prefix` is given, the ID is appended to it.
 *
 * @since 0.1.0
 * @category Util
 * @param {string} [prefix=''] The value to prefix the ID with.
 * @returns {string} Returns the unique ID.
 * @see random
 * @example
 *
 * uniqueId('contact_')
 * // => 'contact_104'
 *
 * uniqueId()
 * // => '105'
 */
export function uniqueId(prefix = '$lodash$') {
  if (!idCounter[prefix]) {
    idCounter[prefix] = 0;
  }

  const id = ++idCounter[prefix];
  if (prefix === '$lodash$') {
    return `${id}`;
  }

  return `${prefix}${id}`;
}