function isValidVariableName (name) {
    if (name.length === 0) { return false }

    for (let i = 0; i < name.length; i++) {
      const cPrev = name.charAt(i - 1)
      const c = name.charAt(i)
      const cNext = name.charAt(i + 1)
      const valid = parse.isAlpha(c, cPrev, cNext) || (i > 0 && parse.isDigit(c))

      if (!valid) {
        return false
      }
    }

    return true
  }
Get a map with all defined variables
@return {Map} values