arraybench

Compares benchmarks for returning slices xor arrays in the following situations:

• return slice that is a wrapper around an existing array (can be optimized out by compiler)
• return slice is a newly allocated copy of an existing array (involves heap allocation)
• return array that exists (can be optimized out by compiler)
• return copy of array (involves stack allocation)

Sample Results

BenchmarkSlice-8                        30000000                57.3 ns/op
BenchmarkSliceWrappingArray-8           100000000               14.4 ns/op
BenchmarkArray-8                        100000000               14.5 ns/op
BenchmarkArrayCopy-8                    50000000                29.7 ns/op