Golang Slice Tricks (github.com)


Published:   August 4, 2021

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Bookmark for: https://github.com/golang/go/wiki/SliceTricks#filtering-without-allocating

Filtering with allocating

This trick uses the fact that a slice shares the same backing array and capacity as the original, so the storage is reused for the filtered slice. Of course, the original contents are modified.

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b := a[:0]
for _, x := range a {
	if f(x) {
		b = append(b, x)
	}
}

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