Array and slice data types

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I found myself confused with the array and slice data types.

From Go docs, arrays are described as follows:

There are major differences between the ways arrays work in Go and C. In Go,

  • Arrays are values. Assigning one array to another copies all the elements.
  • In particular, if you pass an array to a function, it will receive a copy of the array, not a pointer to it.
  • The size of an array is part of its type. The types [10]int and [20]int are distinct.

Functions:

As in all languages in the C family, everything in Go is passed by value. That is, a function always gets a copy of the thing being passed, as if there were an assignment statement assigning the value to the parameter. For instance, passing an int value to a function makes a copy of the int, and passing a pointer value makes a copy of the pointer, but not the data it points to.

Why does sort.Ints(arrayValue) modify the passed variable when I declared it as an array, not as a slice?

Code

var av = []int{1,5,2,3,7}

fmt.Println(av)
sort.Ints(av)
fmt.Println(av)
return

Output

[1 5 2 3 7]
[1 2 3 5 7]
go pass-by-value slice func arrays
5 Answers

slices are pointer to array . when you copy an array to another or when you pass a array in the function the entire copy of array is copied or passed . This makes a costlier operation if thae array size is large. so we can go for slices.

user_109320000
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