How Can I Allocate Arrays with Dynamic Run-time Size in Go?

Allocating Arrays with Dynamic Run-time Size in Go

Unlike in many other programming languages, directly allocating arrays with a run-time size is not possible in Go. However, there is an alternative solution that involves utilizing slices.

The following example illustrates the issue:

n := 1
var a [n]int // Illegal array bound n

In Go, the array size must be a constant expression. To overcome this limitation, you can create a slice using the make function:

n := 12
s := make([]int, n, 2*n) // Creates a slice and underlying array with size 2*n

In this example, s is initialized as a slice with a capacity of 2*n and length n. The underlying array is allocated by Go and hidden from direct manipulation.

Slices are preferred over arrays in Go due to their dynamic nature and the ability to grow or shrink as needed. They offer more flexibility and efficiency in handling dynamic data. By utilizing slices, you can circumvent the restrictions on fixed-size arrays and work with dynamically sized arrays during runtime.

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