substance/util/flattenOften.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 flatten from './flatten'

export default function flattenOften (arr, max) {
  if (!(max > 0)) throw new Error("'max' must be a positive number")
  let l = arr.length
  arr = flatten(arr)
  let round = 1
  while (round < max && l < arr.length) {
    l = arr.length
    arr = flatten(arr)
    round++
  }
  return arr
}