This is an attempt of finding a performant way to perform a deep comparison of two Maps of JSON-like data, where the keys are strings and the values are either null, bools, nums, Strings or Lists/Maps thereof.
const DeepCollectionEquality().equals(a, b) works, but is very slow and runs in O(n^2) time where n is the nesting level of the json mao.
This is an attempt to find a faster way.
Example output when running bin/benchmark.dart in release mode:
Benchmarking json map with nesting level level 0
DeepCollectionEquality: 25μs 4.81x
json_equals : 5μs 1.00x
json_encode : 28μs 5.39x
deep_equality : 6μs 1.19x
================================================================================
Benchmarking json map with nesting level level 1
DeepCollectionEquality: 147μs 12.22x
json_equals : 12μs 1.00x
json_encode : 59μs 4.93x
deep_equality : 14μs 1.19x
================================================================================
Benchmarking json map with nesting level level 2
DeepCollectionEquality: 681μs 27.02x
json_equals : 25μs 1.00x
json_encode : 126μs 4.99x
deep_equality : 30μs 1.20x
================================================================================
Benchmarking json map with nesting level level 3
DeepCollectionEquality: 3068μs 59.41x
json_equals : 52μs 1.00x
json_encode : 267μs 5.16x
deep_equality : 69μs 1.33x
================================================================================
Benchmarking json map with nesting level level 4
DeepCollectionEquality: 12346μs 116.90x
json_equals : 106μs 1.00x
json_encode : 544μs 5.15x
deep_equality : 126μs 1.19x
================================================================================
Benchmarking json map with nesting level level 5
DeepCollectionEquality: 51632μs 242.06x
json_equals : 213μs 1.00x
json_encode : 1088μs 5.10x
deep_equality : 252μs 1.18x
================================================================================
Benchmarking json map with nesting level level 6
DeepCollectionEquality: 199651μs 467.35x
json_equals : 427μs 1.00x
json_encode : 2215μs 5.18x
deep_equality : 509μs 1.19x
================================================================================
Benchmarking json map with nesting level level 7
DeepCollectionEquality: 797276μs 921.68x
json_equals : 865μs 1.00x
json_encode : 4415μs 5.10x
deep_equality : 1013μs 1.17x
================================================================================
Benchmarking json map with nesting level level 8
DeepCollectionEquality: 3199949μs 1867.20x
json_equals : 1714μs 1.00x
json_encode : 8412μs 4.91x
deep_equality : 2040μs 1.19x
================================================================================
Benchmarking json map with nesting level level 9
DeepCollectionEquality: 12801026μs 3716.82x
json_equals : 3444μs 1.00x
json_encode : 16495μs 4.79x
deep_equality : 4084μs 1.19x
================================================================================