How can you increase the size of an array in a programming language to hold more elements?

In Go, arrays have a fixed size determined at declaration, and it cannot be changed. To work with a dynamic size, slices are used, which are wrappers over arrays and can automatically expand.

If you need to increase the size of a slice, you typically use the append function, which, if necessary, allocates a new array with a larger size and copies the data:

var s []int
s = append(s, 1, 2, 3) // adding elements

// If you want to increase the size of a slice in advance, you can create a new slice with a larger capacity:
newSlice := make([]int, len(s), cap(s)*2) // double the capacity
copy(newSlice, s)
s = newSlice

Thus, to "increase an array" in Go, slices and the append function are used, not the arrays themselves.