How to Flatten a 2D Slice into a 1D Slice in Go?

Flattening a 2D Slice into a 1D Slice in Go

In Go, there is currently no native function that allows for the flattening of a 2D slice into a 1D slice in a single operation. However, there are several straightforward and explicit ways to achieve this.

One approach is to use a loop to iterate over each element of the 2D slice and append it to the 1D slice:

var newArr []int32
for _, a := range arr {
  newArr = append(newArr, a...)
}

This method is clear and concise, making it easy to understand and implement.

Another option is to leverage the built-in append() function to concatenate multiple slices into a single slice:

newArr := append([]int32{}, arr...)

This approach directly appends the entire 2D slice to the 1D slice, providing a slightly more concise solution.

Finally, if the 2D slice contains slices of equal length, it is possible to use slicing and the copy() function to create the 1D slice:

length := len(arr[0])
newArr := make([]int32, len(arr) * length)
for i, a := range arr {
  copy(newArr[i * length:], a)
}

This method is more complex but may be more efficient in certain scenarios.

While Go lacks a dedicated function for flattening slices, these workarounds offer simple and efficient solutions for converting 2D slices into 1D slices.

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