JavaScript function to convert from binary to decimal

binary2decimal.js

const IS_BINARY_REGEX = /^[01]+$/
const reverseString = require('reverse-string')
const { immediateError, ErrorType } = require('immediate-error')

function binary2decimal(binary) {
  if (typeof binary !== 'string' && !(binary instanceof String) && typeof binary !== 'number' && !(binary instanceof Number)) {
    return immediateError('Binary must be a string or fake decimal number that consists of ones and zeroes and is actually a binary number.', ErrorType.TypeError)
  }
  binary = binary.toString()
  if (!binary.match(IS_BINARY_REGEX)) {
    return immediateError('Binary must be actual binary and only consist of ones and zeroes.', ErrorType.TypeError)
  }
  let decimal = 0
  let currentPlace = 1
  const binaryReversed = reverseString(binary)
  const binaryArray = binaryReversed.split('')
  binaryArray.forEach(bit => {
    decimal += currentPlace * parseInt(bit)
    currentPlace = currentPlace * 2
  })
  return decimal
}

module.exports = binary2decimal