substance/util/createCountingIdGenerator.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing system. It is developed to power our online editing platform [Substance](http://substance.io).

import hasOwnProperty from './hasOwnProperty'

export default function createCountingIdGenerator () {
  var counters = {}
  return function uuid (prefix) {
    if (!hasOwnProperty(counters, prefix)) {
      counters[prefix] = 1
    }
    var result = [prefix, '-', counters[prefix]++].join('')
    return result
  }
}