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Slices with Functions

Slices with Functions

This lesson explains handling slices as parameters to the functions in detail.

We'll cover the following...

Passing a slice to a function #

If you have a function that must operate on an array, you probably always want to declare the formal parameter to be a slice. When you call the function, slice the array to create (efficiently) a slice reference and pass that. For example, here is a program that sums all elements in an array:

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package main
import "fmt"
func sum(a []int) int {   // function that sums integers
  s := 0
  for i := 0; i < len(a); i++ {
    s += a[i]
  }
  return s
}
func main() {
  var arr = [5]int{0,1,2,3,4} // declare an array
  fmt.Println(sum(arr[:]))    // passing slice to the function
}

In the above program, we have a function sum, that takes slice of an array a as a parameter and returns the sum of the elements present in a. Look at its header at line 4. In the main function, at line 13, we declare an array ...