toroman

A minimalist library for Roman numeral operations.

🚀 Features

• Convert 🔁 Arabic numerals 🔢 to Roman numerals
• Convert 🔁 Roman numerals to Arabic numerals 🔢
• Validate Roman numerals ✅
• Add Roman numerals ➕
• Subtract Roman numerals ➖
• Multiply Roman numerals ✖️
• Divide Roman numerals ➗
• Get maximum Roman numeral ⬆️
• Get minimum Roman numeral ⬇️
• Get a random Roman numeral 🤹
• Generate a table of Roman numerals 📋
• Get Roman numerals within a range 📡

📦 Installation

It can be installed with npm.

npm i toroman

📥 Usage

const roman = require("toRoman");

🔩 Methods

🔄 Convert integer to Roman numerals: toRoman

/**
 * Convert an integer to Roman numerals
 * @param { number } value Integer to be converted to Roman numerals
 * @returns { string } Roman numeral representation of the input value
 * @throws { Error } When the input is not a valid integer or is out of range
 */
function toRoman(value: number): string {}

🔵 Example

console.log(roman.toRoman(765));

// Returns DCCLXV

🔁 Convert Roman numeral to integer: fromRoman

/**
 * Convert Roman numeral to integer
 * @param { string } value Roman numeral to be converted to integer
 * @returns { number } Integer representation of the input value
 * @throws { Error } When the input is not a valid Roman numeral
 */
function fromRoman(value: string): number {}

🔵 Example

console.log(roman.fromRoman("DCCLXV"));

// Returns 765

🔍 Confirm if string is valid Roman numeral: isRoman

/**
 * Confirm that string is a valid roman numeral
 * @param { string } value String to be tested
 * @returns { boolean } true or false
 * @throws { Error } When the input is not a valid roman numeral
 */
function isRoman(value: string): true {}

🔵 Example

console.log(roman.isRoman("MMMCCXXXIV"));

// Returns true

➕ Sum Roman numerals and get output as a Roman numeral or numbers: sum

/**
 * Sum roman numerals
 * @param expected { string } Expected response type
 * @param args { string[] } Roman numerals to be added
 * @returns { string | number } Final roman numeral
 * @throws { Error } When the result exceeds maximum value of 3999 or invalid numeral is provided
 */
function sum(expected: "number" | "roman", ...args: string[]): general {}

🔵 Example

console.log(roman.sum("number", "X", "MXC"));

// Returns 1100

➖ Get difference between two Roman numerals and get output as a Roman numeral or numbers: diff

/**
 * Get difference between two roman numerals
 * @param expected { string } Expected response type
 * @param numerals { string[] } Roman numerals to subtract
 * @returns { string | number }
 * @throws { Error } When more than two numerals are provided
 */
function diff(
  expected: "number" | "roman",
  numerals: [string, string]
): general {}

🔵 Example

console.log(roman.diff("number", ["X", "MXC"]));

// Returns 1080

✖️ Multiply Roman numerals and get output as a Roman numeral or numbers: multiply

/**
 * Multiply roman numerals
 * @param expected { string } Expected response type
 * @param args { string[] } Roman numerals to be added
 * @returns { string | number } Final roman numeral
 * @throws { Error } When the result exceeds maximum value of 3999 or invalid numeral is provided
 */
function multiply(expected: "number" | "roman", ...args: string[]): general {}

🔵 Example

console.log(roman.multiply("roman", "X", "V"));

// Returns L

➗ Divide two Roman numerals and get output as a Roman numeral or numbers: divide

/**
 * Divide two roman numerals
 * @param expected { string } Expected response type
 * @param numerals { string[] } Roman numerals to divide
 * @returns { string | number }
 * @throws { Error } When more than two numerals are provided
 */
function divide(
  expected: "number" | "roman",
  numerals: [string, string]
): general {}

🔵 Example

console.log(roman.divide("number", ["L", "X"]));

// Returns 5

⬆️ Get maximum Roman numeral from a list: max

/**
 * Get maximum roman numeral from a list
 * @param args { string[] } Roman numerals to compare
 * @returns { string } Maximum roman numeral
 * @throws { Error } When an invalid numeral is provided
 */
function max(...args: string[]): string {}

🔵 Example

console.log(roman.max("X", "V", "III", "VIII"));

// Returns X

⬇️ Get minimum Roman numeral from a list: min

/**
 * Get minimum roman numeral from a list
 * @param args { string[] } Roman numerals to compare
 * @returns { string } Minimum roman numeral
 * @throws { Error } When an invalid numeral is provided
 */
function min(...args: string[]): string {}

🔵 Example

console.log(roman.min("X", "V", "III", "VIII"));

// Returns III

🤹 Get a random Roman numeral: random

/**
 * Generate a random Roman numeral within a specified range
 * @param max Maximum value
 * @param min Minimum value
 * @returns { string } Random Roman numeral within the specified range
 * @throws { Error } When the inputs are invalid or out of range
 */
function random(max: general = 3999, min: general = 1): string {}

🔵 Example

console.log(roman.random(10));

// Returns a random Roman numeral between I and X

📋 Generate a table of Roman numerals: table

/**
 * Generate a table of Roman numerals within a specified range
 * @param start Starting point for table
 * @param end Stopping point for table
 * @returns { number: number; roman: string }[] Array of objects containing number and its Roman numeral representation
 * @throws { Error } When the inputs are invalid or out of range
 */
function table(
  start: general,
  end: general
): { number: number; roman: string }[] {}

🔵 Example

console.log(roman.table("I", "V"));

/**
 * Returns [
 * { number: 1, roman: 'I' },
 * { number: 2, roman: 'II' },
 * { number: 3, roman: 'III' },
 * { number: 4, roman: 'IV' },
 * { number: 5, roman: 'V' }
 * ]
 */

📡 Get a range of Roman numerals: range

/**
 * Get range of roman numerals
 * @param end { string | number } Value to stop at
 * @param start { string | number } Value to start from
 * @param intervals { string | number } Difference between values
 * @returns { string[] } Array of roman numerals in the specified range
 * @throws { Error } When any of the inputs are invalid or out of range
 */
function range(
  end: general,
  start: general = "I",
  intervals: general = "I"
): string[] {}

🔵 Examples

console.log(roman.range(7));

// Returns [ 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII' ]

⏭️ Get the next Roman numeral: nextRoman

/**
 * Get the next Roman numeral
 * @param value Current Roman numeral
 * @returns { string } Next Roman numeral
 * @throws { Error } When the input is invalid or out of range
 */
export function nextRoman(value: string): string {}

🔵 Example

console.log(roman.nextRoman("XIV"));

// Returns XV

⏮️ Get the previous Roman numeral: prevRoman

/**
 * Get the previous Roman numeral
 * @param value Current Roman numeral
 * @returns { string } Previous Roman numeral
 * @throws { Error } When the input is invalid or out of range
 */
export function previousRoman(value: string): string {}

🔵 Example

console.log(roman.previousRoman("XIV"));

// Returns XIII

🔀 Map an array of general inputs to either numbers or Roman numerals: map

/**
 * Map an array of general inputs to either numbers or Roman numerals
 * @param expected { string } Expected response type
 * @param args { general[] } Array of general inputs
 * @returns { general[] } Mapped array of numbers or Roman numerals
 * @throws { Error } When any of the inputs are invalid or out of range
 */
export function map(expected: "number" | "roman", args: general[]): general[] {}

🔵 Example

console.log(roman.map("roman", [1, 2, 3, 4, 5]));

// Returns [ 'I', 'II', 'III', 'IV', 'V' ]

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