$ mix bench
Compiling 1 file (.ex)
Not all of your protocols have been consolidated. In order to achieve the
best possible accuracy for benchmarks, please ensure protocol
consolidation is enabled in your benchmarking environment.

Operating System: Linux
CPU Information: Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
Number of Available Cores: 8
Available memory: 15.52 GB
Elixir 1.10.3
Erlang 23.0

Benchmark suite executing with the following configuration:
warmup: 10 s
time: 10 s
memory time: 5 s
parallel: 8
inputs: Small map
Estimated total run time: 1.25 min

Benchmarking :maps.fold with input Small map...
Benchmarking Enum.reduce with input Small map...
Benchmarking IterReduce.iter_reduce with input Small map...

##### With input Small map #####
Name                             ips        average  deviation         median         99th %
IterReduce.iter_reduce      285.67 K        3.50 μs  ±1479.67%        2.40 μs       10.31 μs
:maps.fold                  260.79 K        3.83 μs  ±1360.34%        2.80 μs        8.13 μs
Enum.reduce                 240.31 K        4.16 μs  ±1074.83%        3.09 μs        9.65 μs

Comparison:
IterReduce.iter_reduce      285.67 K
:maps.fold                  260.79 K - 1.10x slower +0.33 μs
Enum.reduce                 240.31 K - 1.19x slower +0.66 μs

Memory usage statistics:

Name                      Memory usage
IterReduce.iter_reduce         1.23 KB
:maps.fold                     1.29 KB - 1.04x memory usage +0.0547 KB
Enum.reduce                    1.29 KB - 1.04x memory usage +0.0547 KB

**All measurements for memory usage were the same**