ichigyou (一行 いちぎょう)

Elegant one-liner utility functions for TypeScript/JavaScript

✨ Why ichigyou?

ichigyou (一行 = "one line" in Japanese) is a carefully curated collection of 54+ concise, battle-tested utility functions written as elegant TypeScript one-liners. Stop reinventing the wheel—use functions that are:

• ⚡ Zero dependencies - Lightweight and tree-shakeable
• 🎯 Type-safe - Full TypeScript support with comprehensive TSDoc
• 🧪 Tested - Each function is thoroughly tested
• 📦 Modular - Import only what you need
• 🚀 Production-ready - Used in real-world applications

📚 Function Categories

🚀 Quick Start

Installation

# npm
npm i ichigyou

# yarn
yarn add ichigyou

# pnpm
pnpm i ichigyou

# bun
bun install ichigyou
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Usage Examples

import { 
  isValidEmail, 
  removeDuplicated, 
  isPrime,
  fibonacci 
} from 'ichigyou'

// String utilities
isValidEmail('user@example.com') // true
toTitleCase('hello world') // 'Hello World'

// Array utilities
removeDuplicated([1, 2, 2, 3, 3, 4]) // [1, 2, 3, 4]
intersection([1, 2, 3], [2, 3, 4]) // [2, 3]

// Number utilities
isPrime(17) // true
fibonacciMemo(10) // 55
gcd(48, 18) // 6
median([1, 2, 3, 4, 5]) // 3
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🎯 Popular Functions

String Operations

isValidEmail(email: string): boolean
isValidURL(url: string): boolean
toTitleCase(str: string): string
isPalindrome(str: string): boolean
removeVowels(str: string): string
isAnagram(str1: string, str2: string): boolean
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Array Manipulation

removeDuplicated<T>(arr: T[]): T[]
intersection<T>(arr1: T[], arr2: T[]): T[] | null
minMax(arr: number[]): { min: number, max: number }
hasUniqueValues<T>(arr: T[]): boolean
isSubset<T>(arr1: T[], arr2: T[]): boolean
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Mathematical Functions

isPrime(num: number): boolean
fibonacciMemo(n: number): number
gcd(num1: number, num2: number): number
lcm(num1: number, num2: number): number
factorial(num: number): number
median(arr: number[]): number
standardDeviation(arr: number[]): number
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📖 Documentation

Full API documentation with detailed examples is available at:
👉 https://koji.github.io/ichigyou/index.html
👉 mintlify document

🤝 Contributing

Contributions are welcome! If you have a useful one-liner function to add:

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-function)
3. Add your function with tests
4. Commit your changes (git commit -m 'Add amazing function')
5. Push to the branch (git push origin feature/amazing-function)
6. Open a Pull Request

📝 License

MIT © Koji Kanao

⭐ Show Your Support

If ichigyou saved you time and keystrokes, give it a star! ⭐

Sample