@agape/string

String manipulation and transformation utilities for TypeScript.

✨ Functions

toCamelCase(input: string)

Converts a string to camelCase format.

toKebabCase(input: string)

Converts a string to kebab-case format.

toPascalCase(input: string)

Converts a string to PascalCase format.

toSnakeCase(input: string)

Converts a string to snake_case format.

toTitleCase(input: string)

Converts a string to Title Case format.

toWords(input: string)

Converts identifiers to natural language words.

toPlural(word: string)

Converts a singular word to its plural form.

toSingular(word: string)

Converts a plural word to its singular form.

quantify(count: number | string, unit: string, plural?: string)

Formats a number with a unit, automatically pluralizing based on count.

🚀 Example

import { 
  toCamelCase, 
  toKebabCase, 
  toPascalCase, 
  toSnakeCase, 
  toTitleCase, 
  toWords, 
  toPlural, 
  toSingular, 
  quantify 
} from '@agape/string';

// Case conversion
toCamelCase('user name')          // "userName"
toCamelCase('email-address')      // "emailAddress"

toKebabCase('Display Name')       // "display-name"
toKebabCase('userProfileId')      // "user-profile-id"

toPascalCase('user id')           // "UserId"
toPascalCase('api_response_code') // "ApiResponseCode"

toSnakeCase('userName')           // "user_name"
toSnakeCase('APIResponseCode')    // "api_response_code"

toTitleCase('the lord of the rings')  // "The Lord of the Rings"
toTitleCase('war and peace')          // "War and Peace"

// Natural language
toWords('user-profile-id')        // "User profile id"
toWords('XMLHttpRequest')         // "XML Http Request"

// Pluralization
toPlural('city')                  // "cities"
toPlural('analysis')              // "analyses"
toPlural('API')                   // "APIs"

toSingular('cities')              // "city"
toSingular('analyses')            // "analysis"
toSingular('APIs')                // "API"

// Quantification
quantify(1, 'item')               // "1 item"
quantify(3, 'box')                // "3 boxes"
quantify(1, 'child', 'children')  // "1 child"
quantify(2, 'child', 'children')  // "2 children"
quantify(5, 'CPU')                // "5 CPUs"

🔧 Function Details

toCamelCase(input: string)

Converts a string to camelCase by removing non-alphanumeric separators and capitalizing each word except the first.

Examples:

• "hello world" → "helloWorld"
• "API_response_code" → "apiResponseCode"
• "user-42-profile" → "user42Profile"

toKebabCase(input: string)

Converts a string to kebab-case by replacing spaces, underscores, and camelCase transitions with dashes. Preserves version tokens like "v2".

Examples:

• "hello world" → "hello-world"
• "UserProfileV2" → "user-profile-v2"
• "HTML5 Parser" → "html-5-parser"

toPascalCase(input: string)

Converts a string to PascalCase by removing non-alphanumeric characters, splitting on casing and digits, and capitalizing each word.

Examples:

• "hello world" → "HelloWorld"
• "user42Profile" → "User42Profile"
• "API response code" → "ApiResponseCode"

toSnakeCase(input: string)

Converts a string to snake_case by replacing spaces, dashes, and camelCase transitions with underscores. Preserves version tokens.

Examples:

• "hello world" → "hello_world"
• "UserProfileV2" → "user_profile_v2"
• "HTML5 Parser" → "html_5_parser"

toTitleCase(input: string)

Converts a string to Title Case by capitalizing the first letter of each word, except for small words (like "of", "and", "the") unless they appear at the beginning.

Examples:

• "the quick brown fox" → "The Quick Brown Fox"
• "a tale of two cities" → "A Tale of Two Cities"
• "API reference guide" → "API Reference Guide"

toWords(input: string)

Converts identifiers to natural language words by splitting camelCase, PascalCase, snake_case, and kebab-case into space-separated words.

Examples:

• "userProfileId" → "User profile id"
• "XMLHttpRequest" → "XML Http Request"
• "api_v2_response" → "Api v2 response"

toPlural(word: string)

Converts a singular word to its plural form using common English pluralization rules.

Features:

• Handles irregular plurals (child → children, person → people)
• Preserves acronyms (API → APIs, ID → IDs)
• Maintains original casing

Examples:

• "city" → "cities"
• "box" → "boxes"
• "child" → "children"
• "API" → "APIs"

toSingular(word: string)

Converts a plural word to its singular form using common English patterns.

Features:

• Handles irregular plurals (children → child, people → person)
• Preserves original casing
• Smart about double letters (boss → boss, not bo)

Examples:

• "cities" → "city"
• "boxes" → "box"
• "children" → "child"
• "APIs" → "API"

quantify(count: number | string, unit: string, plural?: string)

Formats a number with a unit, automatically pluralizing the unit based on the count.

Parameters:

• count: Number of units (number or string)
• unit: Label for the singular unit
• plural: Optional plural label (auto-generated if not provided)

Examples:

• quantify(1, 'item') → "1 item"
• quantify(3, 'box') → "3 boxes"
• quantify(1, 'child', 'children') → "1 child"
• quantify(2, 'child', 'children') → "2 children"

📚 Documentation

See the full API documentation at agape.dev/api.

📦 Agape Toolkit

This package is part of the Agape Toolkit - a comprehensive collection of TypeScript utilities and libraries for modern web development.