run-kit 0.7.1

Universal multi-language runner and smart REPL
Documentation 
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// calculator.wit
// 
// This WIT interface defines a simple calculator contract.
// Any language can implement this interface, and any language can call it.
// Zero handwritten FFI required.

package example:calculator@1.0.0;

/// A simple calculator interface
interface calculator {
    /// Add two numbers
    add: func(a: s32, b: s32) -> s32;
    
    /// Subtract b from a
    subtract: func(a: s32, b: s32) -> s32;
    
    /// Multiply two numbers
    multiply: func(a: s32, b: s32) -> s32;
    
    /// Divide a by b, returns error if b is zero
    divide: func(a: s32, b: s32) -> result<s32, string>;
    
    /// Calculate the nth Fibonacci number
    fibonacci: func(n: u32) -> u64;
}

/// Advanced math operations
interface advanced-math {
    /// Calculate factorial
    factorial: func(n: u32) -> result<u64, string>;
    
    /// Check if a number is prime
    is-prime: func(n: u64) -> bool;
    
    /// Calculate greatest common divisor
    gcd: func(a: u64, b: u64) -> u64;
}

/// The calculator world - defines what a calculator component provides
world calculator-world {
    /// Export the calculator interface
    export calculator;
    
    /// Optionally export advanced math
    export advanced-math;
}

/// World for a component that uses a calculator
world calculator-user {
    /// Import a calculator to use
    import calculator;
}