List is an implementation of C#'s List<T> type in Go.
This is not something that should be used practically and only stands here as an exercise in data structures.
As shown by the benchmarks below the builtin append() function on slices works more efficiently than this implementation. The implementations are similar in principle, except for the Go specification optimisations found in append() and its lack of use of generics.
goos: linux
goarch: amd64
pkg: github.com/mickyco94/list
cpu: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz
BenchmarkAdd-8 41773298 37.46 ns/op 50 B/op 0 allocs/op
BenchmarkAppend-8 73854888 34.68 ns/op 82 B/op 0 allocs/op