Remove trailing zeros, and increment value

index.js

// Map location to a range, based on the number of trailing zeroes.
// e.g. 50000 will become { from: 50000, to: 60000 }
// 50100 will become { from: 50100, to: 50200 }
// 10600 will become { from: 10600, to: 10700 }
export function mapLocation (code) {
  const reverseString = s => s.split('').reverse().join('')

  const str = code.toString()
  const startLen = str.length
  const trimmedZeros = reverseString(parseInt(reverseString(str), 10).toString())
  const endLen = trimmedZeros.length

  const multiplier = Math.pow(10, startLen - endLen)
  const from = parseInt(str, 10)
  const to = from + multiplier
  return { from, to }
}