Convert a roman numeral to a number

romanToDecimal.js

const dict = [
  ['CM', 900], ['M', 1000], ['CD', 400], ['D', 500],
  ['XC', 90], ['C', 100], ['XL', 40], ['L', 50],
  ['IX', 9], ['X', 10], ['IV', 4], ['V', 5],
  ['I', 1],
]

function romanToInt (original) {
  let temp = original
  let int = 0

  while (temp.length > 0) {
    let found = false

    for (const [glyph, quantity] of dict) {
      if (temp.startsWith(glyph)) {
        int += quantity
        temp = temp.slice(glyph.length)
        found = true
        break
      }
    }

    if (!found) {
      throw new Error(`Error parsing roman numeral "${original}" at "${temp}"`)
    }
  }

  return int
}