How to Flatten Multidimensional Slices into One-Dimensional Slices in Go?

Converting Multidimensional to One-Dimensional Slice in Go

In programming, it is often necessary to convert multidimensional slices into one-dimensional slices for various reasons. However, Go does not provide a direct function for performing this operation.

1D Slice from Predetermined 2D Slice

For a known and static 2D slice, a simple loop can efficiently flatten it into a 1D slice:

var arr2d = [][]int32{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
var arr1d []int32
for _, a := range arr2d {
    arr1d = append(arr1d, a...)
}

This approach iterates over each element in the 2D slice and accumulates them into the 1D slice arr1d, resulting in:

arr1d = [1, 2, 3, 4, 5, 6, 7, 8, 9]

Generic Flattening for Unknown Dimensionality

For cases where the dimensions of the 2D slice are unknown or dynamic, a more robust approach is required. While Go lacks a built-in function for generic flattening, several packages provide this functionality:

• arrayutils: https://pkg.go.dev/github.com/icza/arrayutils#FlattenSlice
• flat: https://pkg.go.dev/github.com/srika403/flat#ExtSliceChain

These packages offer functions that recursively flatten multidimensional slices of any depth into a single-dimensional slice.

Conclusion

Although Go does not provide a built-in method for flattening multidimensional slices, effective solutions exist using loops or external packages. Understanding these approaches allows for efficient conversion of complex data structures for various programming scenarios.

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