Use copy for copying slices instead of manually copying the elements in a loop.

The built-in function copy assist in common slice operations. The function copy copies slice elements from a source src to a destination dst and returns the number of elements copied. Note that the number of elements copied is the minimum of len(src) and len(dst). Therefore, to copy all the slice elements from src to dst, dst must satisfy len(dst) >= len(src).

copy(dst, src []T) int

Bad practice

for i, elem := range src {
    dst[i] = elem
}

Recommended

copy(dst, src)

References

Appending to and copying slices

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