How do Golang functions interact with other languages?

Go allows interaction with other languages ​​via CGO and external invocation (FFI). CGO is used to call C code, while FFI can be used to call functions in JavaScript, Python and other languages. For example, you can use FFI to call the Python function sum_numbers so that you can use it with Go code in JavaScript.

#How do Go functions interact with other languages?

Go provides powerful support that allows you to use functions written in other languages ​​without leaving your Go code. Here's how to do it:

Using CGO

CGO allows you to call C code. Here's how to use it:

// #include <stdio.h>
import "C"

func main() {
    C.printf("Hello, world!\n")
}

Using External Invocation (FFI)

FFI allows you to call functions in other languages, such as JavaScript and Python. The following is how to use FFI to call JavaScript functions:

package main

import (
    "github.com/gopherjs/gopherjs/js"
)

func main() {
    js.Global.Get("document").Get("getElementById").Invoke("myElement")
}

Practical case: Calling Python functions

Suppose you have the following Python functions:

def sum_numbers(a, b):
    return a + b

You can Call this function in Go using FFI:

package main

import (
    "github.com/gopherjs/gopherjs/js"
)

func main() {
    pyFunc := js.Global.Get("sum_numbers")
    result := pyFunc.Invoke(js.MakeWrapperType(1), js.MakeWrapperType(2))
    js.Global.Get("console").Call("log", result)
}

When you run this code, it will call the Python function in JavaScript and print the result.

Note:

Using FFI requires accurate knowledge of the API of the target language. There are also third-party libraries available to facilitate FFI, such as [github.com/gonum/cgo](https://github.com/gonum/cgo).

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