When Should I Choose Parameters Over Closures in Go Functions?

Passing Parameters to Function Closures in Go

In Go, defining functions as closures allows them to access and modify variables from the scope in which they were created. However, passing parameter values to these functions introduces another layer of consideration.

When to Use Parameters over Closures

When working with channels or other shared data, using parameters can provide clarity and reduce potential race conditions. In the first example provided, the parameter technique is preferred because it ensures that each goroutine receives a copy of the channel done that is unique to that goroutine.

Benefits of Closures

Closures, on the other hand, offer advantages when you need to share the same variable among multiple function calls. In the example where the value of i is printed within goroutines, using a closure ensures that all function calls use the same variable i.

Parameter Usage for Returning Functions

As you mentioned, parameters are necessary in situations where you need to return a function with specific input values. For example, if you have a function foo that takes two parameters x and y, you can create a new function bar that returns a function of x and y values:

func foo(x int, y int) {
    // ...
}

func bar(x int, y int) func() {
    return func() {
        foo(x, y)
    }
}

This allows you to create multiple functions that essentially call foo with the specified x and y values.

In summary, whether to use parameters or closures depends on the specific requirements of your program. Parameters ensure each function instance has its own copy of the passed arguments, while closures allow for shared variables among multiple function calls. Understanding these differences will help you optimize your Go code for performance and clarity.

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