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Go Function Recursion


Recursion

Go accepts function recursion, which means a defined function can call itself.

Recursion is a common mathematical and programming concept. It means that a function calls itself. This has the benefit of meaning that you can loop through data to reach a result.

The developer should be very careful with recursion as it can be quite easy to slip into writing a function which never terminates, or one that uses excess amounts of memory or processor power. However, when written correctly recursion can be a very efficient and mathematically-elegant approach to programming.

In this example, factorial_recursion() is a function that we have defined to call itself ("recurse"). We use the x variable as the data, which decrements (-1) every time we recurse. The recursion ends when the condition is not greater than 0 (i.e. when it is 0).

To a new developer it can take some time to work out how exactly this works, best way to find out is by testing and modifying it.

Example

package main
import ("fmt")


func factorial_recursion(x float64) (y float64) {
  if x > 0 {
     y = x * factorial_recursion(x-1)
  } else {
     y = 1
  }
  return
}

func main() {
  fmt.Println(factorial_recursion(4))
}

Result:

24
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