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tinywasm/fmt

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fmt

fmt is a lightweight Go library that provides comprehensive string manipulation, type conversion, formatting, and multilingual error handling with a fluid API, specifically designed for small devices and web applications using TinyGo as the target compiler.

Key Features

  • 🚀 Fluid and chainable API - Easy to use and readable operations
  • 📝 Complete string toolkit - Transformations, conversions, formatting, and error handling
  • 🌍 Multilingual error messages - Opt-in dictionary system with 9 languages via fmt/lang
  • 🧵 Concurrency safe - Thread-safe operations for concurrent environments
  • 📦 Zero dependencies - No fmt, strings, strconv, or errors imports
  • 🎯 TinyGo optimized - Manual implementations for minimal binary size
  • 🌐 WebAssembly-first - Designed for modern web deployment
  • 🔄 Universal type support - Works with strings, numbers, booleans, and slices
  • Performance focused - Predictable allocations and custom optimizations

Installation

go get github.com/tinywasm/fmt

Usage

import . "github.com/tinywasm/fmt"

// Quick start - Basic conversion and transformation
text := Convert("Hóla Múndo").Tilde().ToLower().String() // out: "hola mundo"

// Working with different data types
numText := Convert(42).String()     // out: "42"
boolText := Convert(true).String()  // out: "true"

// Memory-efficient approach using string pointers
original := "Él Múrcielago Rápido"
Convert(&original).Tilde().CamelLow().Apply()
// original is now: "elMurcielagoRapido"

// Efficient builder and chaining with accent normalization
items := []string{"  ÁPPLE  ", "  banána  ", "  piñata  ","  ÑANDÚ  "}
builder := Convert() // without params reused buffer = optimal performance
for i, item := range items {
    processed := Convert(item).
        TrimSpace(). // TrimSpace whitespace
        Tilde(). // Normalize accents
        ToLower(). // Convert to lowercase
        Capitalize(). // Capitalize first letter
        String() // Finalize the string
    builder.Write(processed)
    if i < len(items)-1 {
        builder.Write(" - ")
    }
}

out := builder.String() // Finalize the string hiding the error
out, err := builder.StringErr() // OR finalize with error handling

// out: "Apple - Banana - Piñata - Ñandu", err: nil

// Check for uppercase prefix (supports Unicode)
isUpper := HasUpperPrefix("Ápple") // out: true

// Multi-term searching (AND/OR) with internal normalization
found := Matches("Hello World", "hello", "world") // out: true
foundAny := MatchesAny("Hello World", "hello", "xyz") // out: true

Documentation

String Manipulation & Conversion

Utilities & Helpers

Benchmarking

Examples



About

Lightweight Go library that provides comprehensive string manipulation, type conversion, formatting, and error handling with a fluid API, specifically designed for small devices and web applications using TinyGo as the target compiler.

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